Question 1

A Triumph sports car starts at rest and accelerates uniformly to a speed of 27.0 m/s in 11.8 s. Calculate the distance the car travels during this time interval.

Accepted Answer

A)  159 m 
B)  320 m 
C)  1.90 km 
D)  640 m 
E)  350 m

Question 2

The displacement of an object during any time interval is ________ the distance it travels during that same time interval.

Accepted Answer

A)  great than or equal to 
B)  less than or equal to 
C)  equal to 
D)  greater than 
E)  much greater than

Question 3

If the speed of particle A is twice that of particle B, the distance particle B travels in a given interval of time as compared with particle A is

Accepted Answer

A)  twice as great. 
B)  half as great. 
C)  the same. 
D)  four times as great. 
E)  one-fourth as great.

Question 4

An object is at x = -3 m and has a velocity of - 4 m/s. It is observed to be slowing down. Its acceleration is

Accepted Answer

A)  positive. 
B)  negative. 
C)  zero. 
D)  negative until the object stops and then positive. 
E)  impossible to determine based on the information provided.

Question 5

A particle that is moving along a straight line decelerates uniformly from 40 cm/s to 20 cm/s in 5.0 s and then has a constant acceleration of 20 cm/s2 during the next 4.0 s. The average speed over the whole time interval is

Accepted Answer

A)  57 cm/s. 
B)  140 cm/s. 
C)  86 cm/s. 
D)  43 cm/s. 
E)  97 cm/s.

Question 6

Four successive displacements of 4 km, 5 km, 4 km, and 2 km are at right angles to each other as shown in the diagram.  The magnitude of the resultant displacement is

Accepted Answer

A)  4 km. 
B)  15 km. 
C)  3 km. 
D)  -5 km. 
E)  -15 km.

Question 7

In which graph of v versus t does the particle end up farthest from its starting point?

Accepted Answer

A)  1 
B)  2 
C)  3 
D)  4 
E)  5

Question 8

Which of the graphs shows motion of a particle that never has a constant acceleration?

Accepted Answer

A)  1) 
B)  2) 
C)  3) 
D)  4) 
E)  5)

Question 9

The displacement of an object for a round trip between two locations

Accepted Answer

A)  is always greater than zero. 
B)  is always less than zero. 
C)  is zero. 
D)  can be greater than or less than but not equal to zero. 
E)  can have any value.

Question 10

You drive for 30 min for 30 km east and then another 30 min for 40 km north. The magnitude of your average velocity for the entire trip is

Accepted Answer

A)  40 km/h. 
B)  50 km/h. 
C)  60 km/h. 
D)  70 km/h. 
E)  80 km/h.

Question 11

An object, located at the origin when t = 0, moves along the x axis as shown in the diagram.  At which point is the object farthest from its starting point?

Accepted Answer

A)  A 
B)  B 
C)  C 
D)  D 
E)  E

Question 12

For uniformly accelerated motion, which of the following quantities must be zero?

Accepted Answer

A)  the initial velocity 
B)  the initial displacement 
C)  the rate of change of the acceleration 
D)  the rate of change of the velocity 
E)  the rate of change of the displacement

Question 13

You drive for 30 min at 100 km/h and then stop for 15 min. You then drive for 45 min at 80 km/h. Your average speed for the entire trip is

Accepted Answer

A)  73 km/h. 
B)  83 km/h. 
C)  88 km/h. 
D)  90 km/h. 
E)  97 km/h.

Question 14

An object is thrown upward with a velocity of 32 ft/s from a stationary balloon that is 48 ft above the ground. If air resistance is ignored, the total time until the object impacts the ground is

Accepted Answer

A)  1.0 s. 
B)  2.0 s. 
C)  3.0 s. 
D)  4.0 s. 
E)  6.0 s.

Question 15

On a graph that shows velocity on the vertical axis and time on the horizontal axis, the area under the curve represents

Accepted Answer

A)  average acceleration. 
B)  average velocity. 
C)  displacement. 
D)  average speed. 
E)  no useful physical quantity.

Question 16

An object is dropped from rest near the surface of Earth. If the time interval during which it falls is cut in half, the distance it falls will

Accepted Answer

A)  double. 
B)  decrease by one-half. 
C)  increase by a factor of four. 
D)  decrease by a factor of four. 
E)  not change.

Question 17

An object is at x = -3 m and has a velocity of 4 m/s. It is observed to be slowing down. Its acceleration is

Accepted Answer

A)  positive. 
B)  negative. 
C)  zero. 
D)  negative until the object stops and then positive. 
E)  impossible to determine based on the information provided.

Question 18

A particle initially at rest undergoes rectilinear i.e., straight line) motion with an acceleration that is constant in magnitude and direction. The velocity of the particle

Accepted Answer

A)  is constant in magnitude and direction. 
B)  is constant in direction only. 
C)  is constant in magnitude only. 
D)  can change in magnitude and direction. 
E)  is described by none of these.

Question 19

An object moves along the x axis as shown in the diagram.  At which point or points is the magnitude of its velocity the smallest?

Accepted Answer

A)  A and E 
B)  B, D, and E 
C)  C only 
D)  E only 
E)  None of these are correct.

Question 20

A vehicle is traveling in the +x direction to x = 100 m. It then reverses direction. At the instant when it changes direction, the velocity of the vehicle is

Accepted Answer

A)  positive. 
B)  negative. 
C)  zero. 
D)  positive then negative. 
E)  negative then positive.

Exam 2: Linear Motion