Chapter 5: Newton's Third Law (from Lecture Slide)

Question 1

Mass is most closely related to

Answer 1

Inertia

Question 2

An object with a mass of 1 kilogram on Earth

Answer 2

Has the same mass on the Moon

Question 3

A cart is pushed and undergoes a certain acceleration. If it were pushed with twice the force while its mass doubles, its acceleration would be

Answer 3

The same

Question 4

Force and Interactions are between

Answer 4

One thing and another

Question 5

Forces and Interactions are requires

Answer 5

A pair of forces acting on two objects

Question 6

Interactions of hand and wall

Answer 6

Pushing on each other

Question 7

Forces and Interactions equal in

Answer 7

Magnitude (Have the same strength) and opposite in direction and make up a single interactions

Question 8

You cannot push the wall unless

Answer 8

It pushes back

Question 9

Newton Third Law

Answer 9

Whenever one object exerts a force on a second object, the second object exerts an equal and opposite force the first

Question 10

To every action there is

Answer 10

Always an opposed equal reaction

Question 11

Interaction

Answer 11

One thing interacts with another

Question 12

Action-Earth (Object A) exerts

Answer 12

Force on ball (Object B)

Question 13

Reaction-Ball (Object B) exerts

Answer 13

Force on Earth (Object A)

Question 14

When you step off a curb, Earth pulls you downward and you pull Earth upward. Why do you not sense Earth moving upward toward you?

Answer 14

It moves, but by an unnoticeable amount. (primarily because the force exerted by Earth on you (due to gravity) is much greater than the force you exert on Earth.)

Question 15

Why don’t equal and opposite forces cancel out?

Answer 15

Applied external force causes the to accelerate-Newton’s Second Law and only the action force

Question 16

Action and reaction do not

Answer 16

Cancel because they act on different objects and external force by accelerating the object

Question 17

The object is

Answer 17

No longer external to the system and the force pair is internal to the system which does not cause acceleration

Question 18

Action and reaction within the system cancel with no external forces, there is

Answer 18

No acceleration of the system

Question 19

The external force is

Answer 19

Friction between the object and its accelerates the system

Question 20

The same force exerted on a small mass produces

Answer 20

A large acceleration

Question 21

The same force exerted on a large mass produces

Answer 21

A small acceleration

Question 22

When a cannon is fired, the accelerations of the cannon and cannonball are different because the:

Answer 22

Masses are different

Question 23

When a bowling ball strikes a bowling pin, which imparts a greater force upon the other?

Answer 23

They impart equal force upon each other

Question 24

When a bowling ball strikes a bowling pin, which experiences a greater acceleration?

Answer 24

Bowling pin.

Question 25

Two people of equal mass on slippery object push off from each other. Will both move at the same speed in opposite direction?

Answer 25

Yes, but only if both push equally.

Question 26

Vector components: Vertical and horizontal component of a vector are

Answer 26

Perpendicular to each other and determined by vector resolution

Question 27

Resolving a vector into its components

Answer 27

V(x) and V(y) are the resolved components of the vector (V)

Question 28

One person pulls on the sled on slippery as shown. Which components of her force F is greater?

Answer 28

The horizontal component F(x) is greater

Question 29

As the ramp is raised, which force remains constant?

Answer 29

Mg

Question 30

As the ramp is raised, how does the magnitude of N change?

Answer 30

N decreases with increases angle of the ramp

Question 31

When the ramp is raised 90 degrees (vertical) what is the net force on block?

Answer 31

The net force is mg

Question 32

When a surface is horizontal the normal force exerted by

Answer 32

The surface has the same magnitude as mg, the force due to gravity

Question 33

Normal force decreases as

Answer 33

An incline increases

Question 34

Mg is vertical and acts downward with only

Answer 34

A weight component pressing against the surface

Question 35

The component of mg that acts

Answer 35

Opposite to the normal force (N) accounts for N being less on an incline

Question 36

If the surface were vertical, acceleration would be a

Answer 36

Full g and it would be in free fall

Question 37

Summary of Newton’s Laws

Answer 37

1) Newton First Law (The Law of Inertia)
2) Newton Second Law (The Law of Acceleration)
3) Newton Third Law (The Law of Interaction)

Question 38

1) Newton First Law (The Law of Inertia)

Answer 38

An object at rest tends to remain at rest, an object in motion tends to remain in motion at constant speed along a straight-line path (F net = 0)

Question 39

2) Newton Second Law (The Law of Acceleration)

Answer 39

When a net force acts on an object, the object will accelerate. The acceleration is directly proportional to the net force and inversely proportional to the mass (Fnet = ma)

Question 40

3) Newton Third Law (The Law of Interaction)

Answer 40

Whenever one object exerts a force on a second object, the second object exerts an equal and opposite force on the first (F(a on b) = -F(b on a ))