Deck 1: Patterns of Motion and Equilibrium

Question 1

According to Galileo,a rolled ball eventually comes to a stop because

A)of friction.
B)of inertia.
C)it seeks its natural state of rest.
D)all of the above

Answer 1

A

Question 2

According to Aristotle,a rolled ball eventually comes to a stop because

A)of friction.
B)of inertia.
C)it seeks its natural state of rest.
D)all of the above

Answer 2

C

Question 3

The scientist first credited for discovering the concept of inertia was

A)Aristotle.
B)Galileo.
C)Newton.
D)Copernicus.

Answer 3

B

Question 4

Aristotle believed that natural laws could be understood by

A)experiment.
B)logic.
C)patterns.
D)mathematics.

Question 5

Shake an object to and fro if you want to judge its

A)mass.
B)weight.
C)both the same
D)none of the above

Question 6

A 1-kg block of iron weighs about

A)1 N.
B)5 N.
C)10 N.
D)more than 10 N.

Question 7

According to Galileo,the test of scientific truth is

A)experiment.
B)philosophical discussion.
C)evident patterns in nature.
D)logic.

Question 8

In contrast to Aristotle's way of explaining nature,Galileo relied on

A)experiment.
B)logic.
C)patterns.
D)mathematics.

Question 9

Lift an object against the force of gravity if you want to judge its

A)mass.
B)weight.
C)both the same
D)none of the above

Question 10

Science greatly advanced when Galileo favored

A)philosophical discussions.
B)experiment.
C)non-mathematical thinking.
D)none of the above

Question 11

A probe in space continues in its motion due to

A)very low friction.
B)its own inertia.
C)it seeking a continued state of motion.
D)none of the above

Question 12

Between mass and weight,the more fundamental quantity is

A)mass.
B)weight.
C)both the same.
D)none of the above

Question 13

Aristotle treated motion by

A)comparing the distance traveled with the time of travel.
B)measurements of distance traveled.
C)dividing it into two classes.
D)all of the above

Question 14

Galileo's demonstration at the Leaning Tower of Pisa

A)confirmed Aristotle's teachings.
B)refuted Aristotle's teachings.
C)failed in their purpose.
D)none of the above

Question 15

Galileo said that if you rolled a ball along a level surface it would

A)slow down due to its natural tendency to come to rest.
B)keep rolling without slowing down if no friction acted upon it.
C)roll as long as its inertia nudged it along.
D)eventually roll in the opposite direction.

Question 16

A kilogram is a unit of

A)mass.
B)weight.
C)both the same
D)none of the above

Question 17

Which has the greatest mass?

A)a fluffed-up king-size pillow
B)a scrunched-up king-size pillow
C)an automobile battery
D)all about the same

Question 18

When Galileo rolled a ball down an incline and up another incline,he found that the ball rolled nearly to

A)its initial height.
B)halfway its original height.
C)three-quarters its original height.
D)higher than its original height.

Question 19

According to Galileo,inertia is a

A)force like any other force.
B)special kind of force.
C)property of all matter.
D)concept opposite to force.

Question 20

A kilogram is a measure of an object's

A)weight.
B)force.
C)mass.
D)gravity.

Question 21

A baseball weighs 1.5 N on Earth.Another type of ball weighs 1.5 N on the Moon.The ball with the greater mass is the

A)baseball.
B)other type of ball.
C)same for each.
D)not enough information

Question 22

When a 10-kg block is simultaneously pushed toward the east with 20 N and toward the west with 15 N,the combination of these forces on the block is

A)5 N west.
B)5 N east.
C)35 N east.
D)35 N west.

Question 23

An object is pulled with three forces: one at 20 N to the right,another at 40 N to the right,and the third at 30 N to the left.The net force is

A)60 N to the right.
B)60 N to the left.
C)30 N to the left.
D)none of the above

Question 24

When the bottom string is pulled slowly in the heavy-ball-and-strings demonstration (Figure 1.7 in your text),tension

A)in the top string is due to your pull plus the weight of the ball.
B)is about the same in both strings.
C)in the bottom string is zero.
D)none of the above

Question 25

A chunk of gold weighs 1 N on Earth.On the Moon its weight would be

A)less.
B)the same.
C)more.

Question 26

A 10-kg mass at Earth's surface weighs about

A)1 N.
B)5 N.
C)10 N.
D)100 N.
E)1000 N.

Question 27

A 50-N object falling in air experiences 30 N of air resistance.The net force on the falling object is

A)0 N.
B)20 N.
C)50 N.
D)80 N.

Question 28

A chunk of metal has a mass of 1 kg on Earth.If the same chunk were on the Moon its mass would be

A)less.
B)the same.
C)more.

Question 29

An object is pulled with two forces,10 N northward and 15 N southward.The magnitude of the net force is

A)0 N.
B)5 N.
C)10 N.
D)15 N.
E)none of the above

Question 30

Your weight is

A)another word for your mass.
B)the gravitational attraction between you and Earth.
C)a property of mechanical equilibrium.
D)the same in all locations.

Question 31

Compared with a 1-kg block of solid iron,a 2-kg block of solid iron has the same

A)mass.
B)volume.
C)weight.
D)all of the above
E)none of the above

Question 32

The net force on an object is

A)most often its weight.
B)the combination of all forces acting on it.
C)the force of friction acting on it.

Question 33

An object is pulled with two forces,10 N northward and 15 N southward.The direction of the net force is to the

A)north.
B)south.
C)east.
D)west.
E)none of the above

Question 34

Compared with the mass of an apple on Earth,the mass of the same apple on the Moon is

A)less.
B)more.
C)the same.

Question 35

A heavy ball hangs by a string,with a second string attached to its bottom (Figure 1.7 in your text).A slow pull on the bottom string breaks the

A)top string.
B)bottom string.
C)top or bottom string equally likely.
D)none of the above

Question 36

A girl pushes a cart to the left with a 100-N force.At the same time a boy pushes it to the right with a 50-N force.The net force exerted on the cart is

A)50 N to the left.
B)50 N to the right.
C)100 N to the left.
D)100 N to the right.

Question 37

A heavy ball hangs by a string,with a second string attached to its bottom (Figure 1.7 in your text).A quick pull on the bottom string breaks the

A)top string.
B)bottom string.
C)top or bottom string equally likely.
D)none of the above

Question 38

The quantity that most relates to the size of an object is

A)mass.
B)weight.
C)volume.
D)none of the above

Question 39

Compared with a 1-kg block of solid iron,a 2-kg block of solid iron has twice as much

A)inertia.
B)mass.
C)volume.
D)all of the above
E)none of the above

Question 40

An object that has twice as much mass as another object also has twice as much

A)inertia.
B)velocity.
C)gravitational acceleration.
D)volume.
E)all of the above

Question 41

A 10-N falling object encounters 4 N of air resistance.The net force on it is

A)0 N.
B)4 N.
C)6 N.
D)10 N.

Question 42

Given that two forces of 10 N and 15 N act horizontally on an object,the net force must

A)be 5 N.
B)be 25 N.
C)be either 5 N or 25 N.
D)lie between 0 N and 25 N.

Question 43

If a non-rotating object has no acceleration,then we can say for certain that it is

A)at rest.
B)moving at constant nonzero velocity.
C)in mechanical equilibrium.
D)all of the above
E)none of the above

Question 44

Whenever the net force on an object is zero,its acceleration

A)may be zero.
B)is zero.
C)and velocity are the same.
D)none of the above

Question 45

Joshua stands on a floor that supports him.When Sydney rides piggy-back on Joshua,the support force by the floor beneath Joshua

A)decreases.
B)remains constant.
C)increases.

Question 46

The equilibrium rule ΣF = 0 applies to

A)objects or systems at rest.
B)objects or systems in uniform motion in a straight line.
C)both of the above
D)neither of the above

Question 47

Daisy weighs 120 N and carries Trixie who weighs 40 N on her back.The support force on Daisy's feet is

A)40 N.
B)120 N.
C)160 N.
D)more than 160 N.

Question 48

The force of friction on a sliding object is 50 N.The applied force needed to maintain a constant velocity is

A)more than 50 N.
B)less than 50 N.
C)50 N.

Question 49

Which has zero acceleration?

A)an object at rest
B)an object moving at constant velocity
C)an object in mechanical equilibrium
D)all of the above
E)none of the above

Question 50

If Burl carried Paul piggy-back while standing in the middle of a scaffold,the tensions in the two supporting ropes would

A)cancel to zero.
B)be equal.
C)be unequal.
D)more easily support Burl and Paul.

Question 51

Burl and Paul on a sign-painting scaffold are in equilibrium,which means that the net upward supporting force of the vertical ropes is

A)equal to their weights.
B)greater than their weights.
C)equal and opposite to the combined weights of Burl,Paul,and the scaffold.
D)none of the above

Question 52

A 10-N falling object encounters 10 N of air resistance.The net force on it is

A)0 N.
B)4 N.
C)6 N.
D)10 N.

Question 53

A bucket of cement is raised by a rope at constant speed at a construction site.Compared with the force of gravity on the bucket,the upward force supplied by the rope is

A)greater.
B)equal.
C)less.

Question 54

A parachutist falling at constant velocity is in a state of

A)dynamic equilibrium.
B)non-dynamic equilibrium.
C)being in and out of dynamic equilibrium.
D)none of the above

Question 55

When sign painters Burl and Paul stand on opposite ends of a scaffold,the tensions in each of the two supporting ropes

A)are equal.
B)depend on the relative weights of Burl and Paul.
C)combine to equal zero.
D)none of the above

Question 56

When a 10-N object is suspended at rest by two equally-taut vertical strands of rope,the tension in each strand is

A)less than 5 N.
B)5 N.
C)more than 5 N.
D)10 N.

Question 57

The support force on a 10-N book that rests on a horizontal surface is

A)less than 10 N.
B)10 N.
C)greater than 10 N.
D)dependent on whether the book lies flat or stands upright.

Question 58

The equilibrium rule states that the vector sum of all forces acting on a

A)body at rest is zero.
B)body in uniform motion is zero.
C)non-accelerating body is zero.
D)all of the above

Question 59

When a crate slides down an incline at a constant velocity it is

A)in dynamic equilibrium.
B)not in dynamic equilibrium.
C)in a state of being in and out of dynamic equilibrium.
D)none of the above

Question 60

Burl and Paul have a total weight of 1300 N.The tensions in the ropes that support the scaffold they stand on add to 1700 N.The weight of the scaffold itself must be

A)400 N.
B)500 N.
C)600 N.
D)800 N.

Question 61

Nellie runs the length of a 100-yard football field in a time of 20 seconds.Her average running speed is

A)1/2 yard/second.
B)5 yards/second.
C)50 yards/second.
D)not enough information

Question 62

The resistive force of friction occurs for

A)solids.
B)liquids.
C)gases.
D)all of the above

Question 63

When you push a crate across a level floor at constant velocity,friction between the crate and the floor is

A)less than your pushing force.
B)the same amount as your pushing force.
C)more than your pushing force.
D)none of the above

Question 64

A 3000-N bear grasping a vertical tree slides down at constant velocity.The friction force between the tree and the bear is

A)30 N.
B)300 N.
C)3000 N.
D)more than 3000 N.

Question 65

A glance at the speedometer on your vehicle will tell you your

A)average speed.
B)instantaneous speed.
C)overall speed.
D)acceleration.

Question 66

As you jump up and down on a floor,the support force by the floor experiences

A)changes.
B)no changes.
C)none of the above.

Question 67

In general,the friction forces between one object and another act

A)in the same direction.
B)in opposite directions.
C)at right angles to each other.
D)none of the above

Question 68

An 800-N man stands at rest with his weight evenly distributed on two bathroom scales.The reading on each scale is

A)200 N.
B)400 N.
C)800 N.
D)1600 N.
E)none of the above

Question 69

When Marie pushes her desk to the right,friction between the floor and the desk acts toward

A)the left.
B)the right.
C)at right angles to her push.
D)none of the above

Question 70

A mosquito flying at 3 m/s encounters a 3-m/s breeze blowing in the opposite direction,which gives it a resulting speed over the ground of

A)0 m/s.
B)3 m/s.
C)4 m/s.
D)6 m/s.

Question 71

When you stand at rest on a pair of bathroom scales,the readings on the scales will always

A)each be half your weight.
B)each equal your weight.
C)add to equal your weight.
D)add up to more than your weight.

Question 72

A crate is at rest on a horizontal floor,with nobody pushing.The friction force acting on the crate is

A)zero.
B)equal to the weight of the crate.
C)between zero and the weight of the crate.
D)none of the above

Question 73

What did Galileo incorporate in his study of motion that Aristotle overlooked?

A)the role of distance
B)the role of time
C)the role of space
D)none of the above

Question 74

Marie pushes horizontally on her desk,but not hard enough to get it moving.The friction force acting on the desk is

A)zero.
B)equal to the weight of the desk.
C)equal and opposite to her push.
D)none of the above

Question 75

The amount of friction that occurs when two blocks slide against each other depends on

A)how much they are pressed together.
B)the "stickiness" of atoms on their surfaces.
C)the kinds of material being pressed.
D)all of the above

Question 76

An empty jug of weight W is at rest on a table.When water of weight w is poured into it,the amount of support force supplied by the table is

A)W.
B)W + w.
C)W - w.
D)none of the above

Question 77

An 800-N woman stands at rest on two bathroom scales so that one scale shows a reading of 500 N.The reading on the other scale is

A)200 N.
B)300 N.
C)400 N.
D)800 N.
E)none of the above

Question 78

The two measurements necessary for calculating average speed are

A)acceleration and time.
B)velocity and time.
C)distance and time.
D)distance and acceleration.
E)velocity and distance.

Question 79

A mosquito flying at 3 m/s encounters a 3-m/s breeze blowing in the same direction,which gives it a resulting speed over the ground of

A)0 m/s.
B)3 m/s.
C)4 m/s.
D)6 m/s.

Question 80

When Lillian hangs from a pair of gym rings,the upward support forces by the rings will always

A)each be half her weight.
B)each be equal to her weight.
C)add up to equal her weight.
D)add up to more than her weight.