Deck 2: Kinematics: Motion in One Dimension

Question 1

If the acceleration of an object is zero,then that object cannot be moving.

Answer 1

False

Question 2

You drive 6.0 km at 50 km/h and then another 6.0 km at 90 km/h.Your average speed over the 12 km drive will be

A)greater than 70 km/h.
B)equal to 70 km/h.
C)less than 70 km/h.
D)exactly 38 km/h.
E)It cannot be determined from the information given because we must also know directions traveled.

Answer 2

C

Question 3

If the velocity of an object is zero at one instant,what is true about the acceleration of that object? (There could be more than one correct choice.)

A)The acceleration could be positive.
B)The acceleration could be negative.
C)The acceleration could be zero.
D)The acceleration must be zero.

Answer 3

A,B,C

Question 4

Which of the following quantities has units of a displacement? (There could be more than one correct choice.)

A)32 ft/s² vertically downward
B)40 km southwest
C)9.8 m/s²
D)-120 m/s
E)186,000 mi

Question 5

Under what condition is average velocity equal to the average of the object's initial and final velocity?

A)This can only occur if there is no acceleration.
B)The acceleration is constant.
C)This can occur only when the velocity is zero.
D)The acceleration must be constantly increasing.
E)The acceleration must be constantly decreasing.

Question 6

Suppose that a car traveling to the west begins to slow down as it approaches a traffic light.Which of the following statements about its acceleration is correct?

A)The acceleration is toward the east.
B)Since the car is slowing down, its acceleration must be negative.
C)The acceleration is zero.
D)The acceleration is toward the west.

Question 7

Which of the following situations is impossible?

A)An object has velocity directed east and acceleration directed west.
B)An object has velocity directed east and acceleration directed east.
C)An object has zero velocity but non-zero acceleration.
D)An object has constant non-zero acceleration and changing velocity.
E)An object has constant non-zero velocity and changing acceleration.

Question 8

When is the average velocity of an object equal to the instantaneous velocity?

A)only when the velocity is increasing at a constant rate
B)only when the velocity is decreasing at a constant rate
C)when the velocity is constant
D)always
E)never

Question 9

If the velocity of an object is zero at some point,then its acceleration must also be zero at that point.

Question 10

When a ball is thrown straight up with no air resistance,the acceleration at its highest point

A)is upward
B)is downward
C)is zero
D)reverses from upward to downward
E)reverses from downward to upward

Question 11

A racing car accelerates uniformly from rest along a straight track.This track has markers spaced at equal distances along it from the start,as shown in the figure.The car reaches a speed of 140 km/h as it passes marker 2. Where on the track was the car when it was traveling at half this speed,that is at 70 km/h?

A)Before marker 1
B)At marker 1
C)Between marker 1 and marker 2

Question 12

Consider a car that travels between points A and B.The car's average speed can be greater than the magnitude of its average velocity,but the magnitude of its average velocity can never be greater than its average speed.

Question 13

Suppose that a car traveling to the east (+x direction)begins to slow down as it approaches a traffic light.Which statement concerning its acceleration must be correct?

A)Its acceleration is in the +x direction.
B)Its acceleration is in the -x direction.
C)Its acceleration is zero.
D)Its acceleration is decreasing in magnitude as the car slows down.

Question 14

A rock from a volcanic eruption is launched straight up.Which one of the following statements about this rock while it is in the air is correct if you neglect the presence of air?

A)On the way up, its acceleration is downward and its velocity is upward, and at the highest point both its velocity and acceleration are zero.
B)On the way down, both its velocity and acceleration are downward, and at the highest point both its velocity and acceleration are zero.
C)Throughout the motion, the acceleration is downward, and the velocity is always in the same direction as the acceleration.
D)The acceleration is downward at all points in the motion.
E)The acceleration is downward at all points in the motion except that is zero at the highest point.

Question 15

Suppose that an object is moving with a constant velocity.Which statement concerning its acceleration must be correct?

A)The acceleration is constantly increasing.
B)The acceleration is constantly decreasing.
C)The acceleration is a constant non-zero value.
D)The acceleration is equal to zero.

Question 16

Suppose that a car traveling to the west (-x direction)begins to slow down as it approaches a traffic light.Which statement concerning its acceleration must be correct?

A)Its acceleration is positive.
B)Its acceleration is negative.
C)Its acceleration is zero.
D)Its acceleration is decreasing in magnitude as the car slows down.

Question 17

An object moving i n the +x direction has an acceleration of +2.0 m/s².This means the object

A)travels 2.0 m in every second.
B)is traveling at 2.0 m/s.
C)is decreasing its velocity by 2.0 m/s every second.
D)is increasing its velocity by 2.0 m/s every second.

Question 18

An auto manufacturer advertises that their car can go "from zero to sixty in eight seconds." This is a description of what characteristic of the car's motion?

A)average speed
B)instantaneous speed
C)average acceleration
D)instantaneous acceleration
E)displacement

Question 19

If the velocity of an object is zero,then that object cannot be accelerating.

Question 20

Which of the following quantities has units of a velocity? (There could be more than one correct choice.)

A)40 km southwest
B)-120 m/s
C)9.8 m/s² downward
D)186,000 mi
E)9.8 m/s downward

Question 21

A ball is thrown downward in the absence of air.After it has been released,which statement(s)concerning its acceleration is correct? (There could be more than one correct choice.)

A)Its acceleration is constantly increasing.
B)Its acceleration is constant.
C)Its acceleration is constantly decreasing.
D)Its acceleration is zero.
E)Its acceleration is greater than g.

Question 22

If the position versus time graph of an object is a horizontal line,the object is

A)moving with constant non-zero speed.
B)moving with constant non-zero acceleration.
C)at rest.
D)moving with increasing speed.

Question 23

An object is moving with constant non-zero velocity in the +x direction.The position versus time graph of this object is

A)a horizontal straight line.
B)a vertical straight line.
C)a straight line making an angle with the time axis.
D)a parabolic curve.

Question 24

A ball is thrown straight up,reaches a maximum height,then falls to its initial height.Which of the following statements about the direction of the velocity and acceleration of the ball as it is going up is correct?

A)Both its velocity and its acceleration point upward.
B)Its velocity points upward and its acceleration points downward.
C)Its velocity points downward and its acceleration points upward.
D)Both its velocity and its acceleration points downward.

Question 25

From the edge of a roof top you toss a green ball upwards with initial speed v₀ and a blue ball downwards with the same initial speed.Neglect air.When they reach the ground below

A)the green ball will be moving faster than the blue ball.
B)the blue ball will be moving faster than the green ball.
C)the two balls will have the same speed.

Question 26

The slope of a velocity versus time graph gives

A)the distance traveled.
B)velocity.
C)acceleration.
D)displacement.

Question 27

The slope of a position versus time graph gives

A)the distance traveled.
B)velocity.
C)acceleration.
D)displacement.

Question 28

Suppose a ball is thrown straight up and there is no air.What is its acceleration just before it reaches its highest point?

A)zero
B)slightly less than g
C)exactly g
D)slightly greater than g

Question 29

An object is moving with constant non-zero velocity in the +x direction.The velocity versus time graph of this object is

A)a horizontal straight line.
B)a vertical straight line.
C)a straight line making an angle with the time axis.
D)a parabolic curve.

Question 30

An object is moving with constant non-zero acceleration in the +x direction.The velocity versus time graph of this object is

A)a horizontal straight line.
B)a vertical straight line.
C)a straight line making an angle with the time axis.
D)a parabolic curve.

Question 31

Two objects are dropped from a bridge,an interval of 1.0 s apart.Neglect air.During the time that both objects continue to fall,their separation

A)increases.
B)decreases.
C)stays constant.
D)increases at first, but then stays constant.
E)decreases at first, but then stays constant.

Question 32

If the velocity versus time graph of an object is a straight line making an angle of +30° (counter clockwise)with the time axis,the object is

A)moving with constant non-zero speed.
B)moving with constant non-zero acceleration.
C)at rest.
D)moving with increasing acceleration.

Question 33

If the velocity versus time graph of an object is a horizontal line,the object is

A)moving with zero acceleration.
B)moving with constant non-zero acceleration.
C)at rest.
D)moving with increasing speed.

Question 34

A 10-kg rock and 20-kg rock are dropped from the same height and there is no air.If it takes the 20-kg rock a time T to reach the ground,what time will it take the 10-kg rock to reach the ground?

A)4T
B)2T
C)T
D)T/2
E)T/4

Question 35

Two objects are thrown from the top of a tall building.One is thrown up,and the other is thrown down,both with the same initial speed.What are their speeds when they hit the street? Neglect air.

A)The one thrown up is traveling faster.
B)The one thrown down is traveling faster.
C)They are traveling at the same speed.
D)It is impossible to tell because the height of the building is not given.

Question 36

An object is moving with constant non-zero acceleration in the +x direction.The position versus time graph of this object is

A)a horizontal straight line.
B)a vertical straight line.
C)a straight line making an angle with the time axis.
D)a parabolic curve.

Question 37

A 10-kg rock and a 20-kg rock are dropped at the same time and there is no air.If the 10-kg rock falls with acceleration a,what is the acceleration of the 20-kg rock?

A)4a
B)2a
C)a
D)a/2
E)a/4

Question 38

A 10-kg rock and a 20-kg rock are thrown upward with the same initial speed v₀ and there is no air.If the 10-kg rock reaches a maximum height h,what maximum height will the 20-kg ball reach?

A)h/4
B)h/2
C)h
D)2h
E)4h

Question 39

Ball A is dropped from the top of a building.One second later,ball B is dropped from the same building.Neglect air.As time progresses,the difference in their speeds

A)increases.
B)remains constant.
C)decreases.
D)cannot be determined from the information given.

Question 40

Brick A is dropped from the top of a building.Brick B is thrown straight down from the same building.Neglect air.Which statement about their accelerations is correct?

A)The acceleration of A is greater than the acceleration of B.
B)The acceleration of B is greater than the acceleration of A.
C)The two bricks have exactly the same acceleration.
D)Neither brick has any acceleration once it is released.

Question 41

A child standing on a bridge throws a rock straight down.The rock leaves the child's hand at time t = 0 s.If we take upward as the positive direction,which of the graphs shown below best represents the acceleration of the stone as a function of time?

Question 42

A motorist travels 160 km at 80 km/h and 160 km at 100 km/h.What is the average speed of the motorist for this trip?

A)84 km/h
B)89 km/h
C)90 km/h
D)91 km/h

Question 43

A light-year is the distance that light travels in one year.The speed of light is 3.00 × 10⁸ m/s.How many miles are there in one light-year? (1 mi = 1609 m,1 y = 365 d)

A)9.46 × 10¹² mi
B)9.46 × 10¹⁵ mi
C)5.88 × 10¹² mi
D)5.88 × 10¹⁵ mi

Question 44

What must be your average speed in order to travel 350 km in 5.15 h?

A)66.0 km/h
B)67.0 km/h
C)68.0 km/h
D)69.0 km/h

Question 45

The motion of a particle is described in the velocity vs.time graph shown in the figure. Over the nine-second interval shown,we can say that the speed of the particle

A)only increases.
B)only decreases.
C)increases and then decreases.
D)decreases and then increases.
E)remains constant.

Question 46

A runner ran the marathon (approximately 42.0 km)in 2 hours and 57 min.What was the average speed of the runner in m/s?

A)14,200 m/s
B)124 m/s
C)3.95 m/s
D)14.2 m/s

Question 47

A child standing on a bridge throws a rock straight down.The rock leaves the child's hand at time t = 0 s.If we take upward as the positive direction,which of the graphs shown below best represents the velocity of the stone as a function of time?

Question 48

The graph in the figure shows the position of an object as a function of time.The letters H-L represent particular moments of time. (a)At which moment in time is the speed of the object the greatest?
(b)At which moment in time is the speed of the object equal to zero?

Question 49

The figure shows a graph of the position x of two cars,C and D,as a function of time t. According to this graph,which statements about these cars must be true? (There could be more than one correct choice.)

A)The magnitude of the acceleration of car C is greater than the magnitude of the acceleration of car D.
B)The magnitude of the acceleration of car C is less than the magnitude of the acceleration of car D.
C)At time t = 10 s, both cars have the same velocity.
D)Both cars have the same acceleration.
E)The cars meet at time t = 10 s.

Question 50

If you run a complete loop around an outdoor track of length 400 m in 100 s,find your
(a)average velocity and (b)average speed.

Question 51

Which of the following graphs represent an object at rest? (There could be more than one correct choice.)

A)graph a
B)graph b
C)graph c
D)graph d
E)graph e

Question 52

A polar bear starts at the North Pole.It travels 1.0 km south,then 1.0 km east,and then 1.0 km north to return to its starting point.This trip takes 45 min.What was the bear's average speed?

A)0.00 km/h
B)0.067 km/h
C)4.0 km/h
D)5.3 km/h

Question 53

If,in the figure,you start from the Bakery,travel to the Cafe,and then to the Art Gallery
(a)what distance you have traveled?
(b)what is your displacement?

Question 54

You are driving home on a weekend from school at 55 mi/h for 110 miles.It then starts to snow and you slow to 35 mi/h.You arrive home after driving 4 hours and 15 minutes.How far is your hometown from school?

A)180 mi
B)190 mi
C)200 mi
D)210 mi

Question 55

If you are driving 72 km/h along a straight road and you look to the side for 4.0 s,how far do you travel during this inattentive period?

A)18 m
B)20 m
C)40 m
D)80 m

Question 56

The motions of a car and a truck along a straight road are represented by the velocity-time graphs in the figure.The two vehicles are initially alongside each other at time t = 0. At time T,what is true of the distances traveled by the vehicles since time t = 0?

A)They will have traveled the same distance.
B)The truck will not have moved.
C)The car will have travelled further than the truck.
D)The truck will have travelled further than the car.

Question 57

The graph in the figure shows the position of a particle as it travels along the x-axis. At what value of t is the speed of the particle equal to 0 m/s?

A)0 s
B)1 s
C)2 s
D)3 s
E)4 s

Question 58

The area under a curve in a velocity versus time graph gives

A)acceleration.
B)velocity.
C)displacement.
D)position.

Question 59

Which of the following graphs represent an object having zero acceleration?

A)only graph a
B)only graph b
C)graphs a and b
D)graphs b and c
E)graphs c and d

Question 60

A polar bear starts at the North Pole.It travels 1.0 km south,then 1.0 km east,and then 1.0 km north to return to its starting point.This trip takes 45 min.What was the bear's average velocity?

A)0.00 km/h
B)0.067 km/h
C)4.0 km/h
D)5.3 km/h

Question 61

A racquetball strikes a wall with a speed of 30 m/s and rebounds in the opposite direction with a speed of 26 m/s.The collision takes 20 ms.What is the average acceleration of the ball during the collision with the wall?

A)0 m/s²
B)200 m/s²
C)2800 m/s²
D)1500 m/s²
E)1300 m/s²

Question 62

A water rocket can reach a speed of 75 m/s in 0.050 seconds from launch.What is its average acceleration?

Question 63

The captain orders his starship to accelerate from rest at a rate of "1 g" (1 g = 9.8 m/s²).How many days does it take the starship to reach 10% the speed of light? (Light travels at 3.0 × 10⁸ m/s.)

Question 64

A runner runs around a track consisting of two parallel lines 96 m long connected at the ends by two semicircles with a radius of 49 m.She completes one lap in 100 seconds.What is her average velocity?

A)2.5 m/s
B)5.0 m/s
C)10 m/s
D)0 m/s
E)1.3 m/s

Question 65

An airplane travels at 300 mi/h south for 2.00 h and then at 250 mi/h north for 750 miles.What is the average speed for the trip?

A)260 mi/h
B)270 mi/h
C)275 mi/h
D)280 mi/h

Question 66

You leave on a 549-mi trip in order to attend a meeting that will start 10.8 h after you begin your trip.Along the way you plan to stop for dinner.If the fastest you can safely drive is 65 mi/h,what is the longest time you can spend over dinner and still arrive just in time for the meeting?

A)2.4 h
B)2.6 h
C)1.9 h
D)You can't stop at all.

Question 67

The velocity v(t)of a particle as a function of time is given by v(t)= (2.3 m/s)+ (4.1 m/s²)t - (6.2 m/s³)t².What is the average acceleration of the particle between t = 1.0 s and t = 2.0 s?

A)-13 m/s²
B)-15 m/s²
C)13 m/s²
D)15 m/s²
E)0 m/s²

Question 68

A bat,flying toward the east at 2.0 m/s,emits a shriek that is reflected back to it from a wall that is 20.0 m in front of the bat at the instant the shriek is emitted.Sound travels at 340 m/s in the air.How many milliseconds after emitting the shriek does the bat hear the reflected echo from the wall?

Question 69

A motorist travels for 3.0 h at 80 km/h and 2.0 h at 100 km/h.What is her average speed for the trip?

A)85 km/h
B)88 km/h
C)90 km/h
D)92 km/h

Question 70

Arthur and Betty start walking toward each other when they are 100 m apart.Arthur has a speed of 3.0 m/s and Betty has a speed of 2.0 m/s.How long does it take for them to meet?

Question 71

If a car accelerates at a uniform 4.0 m/s²,how long will it take to reach a speed of 80 km/hr,starting from rest?

Question 72

A runner runs around a track consisting of two parallel lines 96 m long connected at the ends by two semicircles with a radius of 49 m.She completes one lap in 100 seconds.What is her average speed?

A)2.5 m/s
B)5.0 m/s
C)10 m/s
D)0 m/s
E)1.3 m/s

Question 73

A car is traveling north at 1.77m/s.After 12 s its velocity is in the same direction.Find the magnitude and direction of the car's average acceleration.

A)0.30 m/s², south
B)2.7 m/s², south
C)0.30 m/s², north
D)2.7 m/s², north

Question 74

A motorist makes a trip of 180 miles.For the first 90 miles she drives at a constant speed of 30 mph.At what constant speed must she drive the remaining distance if her average speed for the total trip is to be 40 mph?

A)45 mph
B)50 mph
C)52.5 mph
D)55 mph
E)60 mph

Question 75

The position x(t)of a particle as a function of time t is given by the equation x(t)= (3.5 m/s)t - (5.0 m/s²)t².What is the average velocity of the particle between t = 0.30 s and t = 0.40 s?

Question 76

If,in the figure,you start from the Bakery,travel to the Cafe,and then to the Art Gallery in 2.00 hours,what is your
(a)average speed?
(b)average velocity?

Question 77

An airplane increases its speed at the average rate of 15 m/s².How much time does it take to increase its speed from 100 m/s to 160 m/s?

A)17 s
B)0.058 s
C)4.0 s
D)0.25 s

Question 78

A car that is initially moving at 7.50 m/s begins to accelerate forward uniformly at 0.550 m/s².
(a)How long after beginning to accelerate does it take the car to move 3.50 km?
(b)How fast is the car moving just as it has traveled 3.50 km?

Question 79

A race car circles 10 times around a circular 8.0-km track in 20 min.Using SI units
(a)what is its average speed for the ten laps?
(b)what is its average velocity for the ten laps?

Question 80

Human reaction times are worsened by alcohol.How much further (in feet)would a drunk driver's car travel before he hits the brakes than a sober driver's car? Assume that both are initially traveling at 50.0 mi/h and their cars have the same acceleration while slowing down,and that the sober driver takes 0.33 s to hit the brakes in a crisis,while the drunk driver takes 1.0 s to do so.(5280 ft = 1 mi)