Deck 1: Patterns of Motion and Equilibrium

Question 1

Science greatly advanced when Galileo favored

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

Answer 1

B

Question 2

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

Answer 2

B

Question 3

A 1-kg mass at Earth's surface weighs about

A)1 N.
B)5 N.
C)10 N.
D)12 N.
E)none of the above

Answer 3

C

Question 4

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

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

Question 5

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 6

Aristotle treated motion by

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

Question 7

Which has the greatest mass?

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

Question 8

According to Galileo, the test of scientific truth is

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

Question 9

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 10

A kilogram is a measure of an object's

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

Question 11

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)roll in the opposite direction.

Question 12

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 13

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 14

Compared with the mass of a certain object on Earth, the mass of the same object on the Moon is

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

Question 15

You would have the largest mass of gold if it weighed 1 N on the

A)Moon.
B)Earth.
C)both the same

Question 16

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 17

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 18

An object weighs 30 N on Earth. A second object weighs 30 N on the Moon. The object with the greater mass is the one on

A)Earth.
B)the Moon.
C)same for each.
D)not enough information

Question 19

Aristotle believed that natural laws could be understood by

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

Question 20

The scientist to first introduce the concept of inertia was

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

Question 21

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 22

You hang from a pair of gym rings and the upward support forces of the rings will always

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

Question 23

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 24

Distinguish between the concepts of mass and weight. Which is more fundamental, and why?

Question 25

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 26

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

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

Question 27

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 28

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

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

Question 29

A girl pushes a cart to the left with a 100-N force. 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 30

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 31

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 32

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 33

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 34

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

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

Question 35

Give three examples of the equilibrium rule that are not cited in the textbook.

Question 36

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 37

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

A)0 N.
B)25 N.
C)50 N.
D)100 N.

Question 38

What is the meaning of the expression ΣF = 0?

Question 39

Place a book that weighs 10 N on a horizontal surface and the support force on the book 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 40

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 41

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

A)greater than the force of gravity.
B)equal to the force of gravity.
C)less than the force of gravity.

Question 42

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/s.
B)5 yards/s.
C)50 yards/s.
D)not enough information

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

The force of friction on a sliding object is 10 N. The applied force needed to maintain a constant velocity is

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

Question 45

An object in mechanical equilibrium is an object

A)at rest.
B)moving at constant velocity.
C)with no acceleration.
D)all of the above

Question 46

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 47

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 48

A man weighing 800 N stands at rest on two bathroom scales so that his weight is distributed evenly over both 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 49

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 50

A glance at your speedometer will tell you your

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

Question 51

A man weighing 800 N 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 52

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 53

The equilibrium rule F = 0 applies to

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

Question 54

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 55

While a crate rests on a horizontal floor 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 56

When you stand at rest on a floor, the number of vertical forces acting on you is

A)zero.
B)one.
C)two.
D)three.
E)four.

Question 57

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)both
D)none of the above

Question 58

When you push a crate across a level floor at constant speed, 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 59

The resistive force of friction occurs for

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

Question 60

When you push your desk to the right, friction on the desk acts toward

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

Question 61

If a ball rolls down an inclined plane and picks up 4 m/s each second it rolls, its acceleration is

A)one half of 4 m/s.
B)one half of 4 m/s².
C)4 m/s².
D)10 m/s².

Question 62

You're lying on the sand on a breezy day when a pesky fly wishes to join you. The breeze is blowing at a steady 2 m/s. In order for the fly to land on you it should hover over you while flying

A)against the breeze at 2 m/s.
B)with the breeze at 2 m/s.
C)faster than 2 m/s.
D)about 4 m/s relative to the breeze.

Question 63

Carefully distinguish between the concepts of velocity and acceleration, with an example of each.

Question 64

When a falling object gains 10 m/s each second, its acceleration is

A)10 m/s.
B)10 m/s².
C)directed upward.
D)steadily increasing.

Question 65

You're driving in a car at 50 km/h and bump into a car ahead traveling at 48 km/h in the same direction. The speed of impact is

A)zero.
B)2 km/h.
C)48 km/h.
D)50 km/h.
E)98 km/h.

Question 66

When she hikes a distance of 1 km in a time of one-half hour her average speed is

A)nearly 1 km/h.
B)1 km/h.
C)slightly more than 1 km/h.
D)twice 1 km/h.

Question 67

At the end of 2 seconds of free fall, an apple falling from rest has a speed of

A)1 m/s.
B)5 m/s.
C)10 m/s.
D)more than 10 m/s.

Question 68

At the end of two seconds of free fall, an object released from rest will have a speed of

A)5 m/s.
B)10 m/s.
C)15 m/s.
D)none of the above

Question 69

When a ball increases in speed by the same amount each second, its acceleration

A)also increases each second.
B)decreases each second.
C)is constant.
D)varies.

Question 70

The average speed of a horse that gallops a distance of 10 km in a time of 30 min is

A)10 km/h.
B)20 km/h.
C)30 km/h.
D)more than 30 km/h.

Question 71

During each second of free fall, the speed of an object

A)increases by the same amount.
B)changes by increasing amounts each second.
C)remains constant.
D)doubles each second.

Question 72

A free-falling object has a speed of 30 m/s at one instant. Exactly 2 seconds later its speed will be

A)the same.
B)40 m/s.
C)50 m/s.
D)more than 50 m/s.

Question 73

In a dream you're in a car traveling at 50 km/h and you bump into another car traveling toward you at 48 km/h. The speed of impact is

A)48 km/h.
B)50 km/h.
C)98 km/h.
D)2400 km/h.

Question 74

While in an airplane flying at 100 km/h you look down from the window and spot another airplane flying at the same speed in the opposite direction. Relative to you, the speed of the spotted plane is

A)zero.
B)100 km/h.
C)150 km/h.
D)200 km/h.

Question 75

A motor scooter undergoes acceleration when it

A)gains speed.
B)decreases speed.
C)changes direction.
D)all of the above.

Question 76

One-half second after starting from rest, a freely falling object will have a speed of about

A)5 m/s.
B)10 m/s.
C)15 m/s.
D)none of the above

Question 77

If a freely falling object were somehow equipped with a speedometer, its speed reading would increase each second by about

A)5 m/s.
B)10 m/s.
C)15 m/s.
D)a variable amount.

Question 78

The average speed of a deer traveling a distance of 2 km in a time of one-half hour is

A)1 km/h.
B)2 km/h.
C)4 km/h.
D)more than 4 km/h.

Question 79

A tutor will be correct in saying that velocity and acceleration are

A)the same concept, but expressed differently.
B)rates of one another.
C)expressions for changing speeds.
D)different concepts.

Question 80

An object in free fall has a speed of 60 m/s. One second later its speed is

A)10 m/s.
B)30 m/s.
C)60 m/s.
D)70 m/s.