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Physics 2018-2019 > Chapter 4 Test > Flashcards

Chapter 4 Test Flashcards

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1
Q

An exert of force when you sit in a chair or something.

A

Force

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2
Q

Give 3 examples of force exerted on an object

A
  1. Throwing a ball
  2. Catching a ball
  3. Hitting a ball
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3
Q

The SI Unit of force is called the ______ and defined as the same amount of force that, when acting on 1 kg mass, produces an acceleration of 1m/s2

A

newton

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4
Q

The weight of an object is a measure of the _______ of the _____ _____ on the object.

A

magnitude

gravitational force

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5
Q

Explain Contact force

A

Result from physical contact between two objects

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6
Q

Explain Field force

A

Does not involve physical contact between two objects.

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7
Q

All _____ contact forces are due to _____ field forces.

A

macroscopic

microscopic

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8
Q

The _____ of an object depends on the force’s _____

A

acceleration

magnitutde

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9
Q

The ____ in which an object moves depends on the ____ of the force

A

direction

direction

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10
Q

What 2 factors make force a vector quantity?

A

magnitude

direction

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11
Q

Give 3 examples

A force causing an object to start moving

A
  1. Pushing a wagon
  2. Pulling a chain
    3, Throwing a ball
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12
Q

Give 3 examples

A force causing an object to stop moving

A
  1. Catching a ball with your mitt
  2. Stopping a skateboard with your foot
  3. Braking in a car
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13
Q

Give 3 examples

A force causing an object to change its direction of motion

A
  1. Hitting a baseball
  2. Tackling a football player
  3. Turning a car
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14
Q

An object at rest remains at rest and an object in motion continues in motion with constant velocity

A

Newton’s First Law

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15
Q

The tendency of an object not to accelerate

A

Inertia

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16
Q

A single force that acts on an object as a result of the interaction between the objects and its environment.

A

External force

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17
Q

The vector sum of all forces acting on an object

A

Net force

18
Q

_____ is the measure of inertia

A

mass

19
Q

The inertia of an object is _____ to the object’s mass

A

proportional

20
Q

Objects that are either at rest or moving with constant velocity

A

equilibrium

21
Q

What condition must be true for equilibrium?

A

The net force acting on a body in equilibrium must be equal to zero.

22
Q

Can an object be in equilibrium if only one force acts on it? Why?

A

No, a second force equal and opposite to the first net force must be present for the object to be at equilibrium.

23
Q

If a car is traveling westward with a constant velocity of 20 m/s, what is the net force acting on the car

A

0

24
Q

If a car is accelerating downhill under a net force of 3674 N, what additional force would cause the car to have a constant velocity?

A

-3674

25
Q

The acceleration of an object is directly proportional to the net force acting on the object and inversely proportional to the object’s mass

A

Newton’s Second Law

26
Q

Newton’s Second Law Equation

A

net force= mass x acceleration

27
Q

If 2 objects interact, the magnitude of the force exerted on object 1 by object 2 is equal to the magnitude of the force simultaneously exerted on object 2 by object 1, and these 2 forces are opposite in direction.

A

Newton’s Third Law

28
Q

Forces always exist in _____

A

pairs

29
Q

For every _____, there an equal and opposite ____.

A

action

reaction

30
Q

Action force

A

The force object 1 exerts on object 2

31
Q

Reaction force

A

the force object 2 exerts on object 1

32
Q
  1. A 6.0 kg object undergoes an acceleration of 2.0m/s2.
    a. What is the magnitude of the net external force acting on it?
    b. If this same force is applied to a 4.0 kg object, what acceleration is produced?
A

a. 12 N

b. 3

33
Q

a child causes a wagon to accelerate by pulling it with a horizontal force. newton’s third law says that the wagon exerts an equal and opposite form on the child. how can the wagon accelerate?

A

the child had to accelerate (not the wagon)

34
Q

identify action-reaction pairs in the following situations.

a. a person takes a step.
b. a snowball hits someone in the back
c. a baseball player catches a ball
d. a gust of wind strikes a window

A

a. the ground exerts force on the foot
b. the back exerts force on the snowball
c. the glove exerts force on the ball
d. the window exerts force on the wind

35
Q

gravitational force exerted on an object.

A

weight

36
Q

a force that acts on the surface in a direction perpendicular to the surface.

A

normal force

37
Q

the force that resists the initiation of sliding motion between two surfaces that are in contact and at rest.

A

static friction

38
Q

the force that opposes the movement of 2 surfaces that are in contact and sliding over each other.

A

kinetic friction

39
Q

the quantity that expresses the dependence of frictional forces on the particular surfaces.

A

coefficient of friction

40
Q

a bag of sugar has a mass of 2.26 kg.

a. what is its weight in newtons on the moon, where the acceleration due to the gravity is one-sixth that on earth?
b. what is its weight on jupiter, where the acceleration of gravity is 2.64 times that on earth.

A

a. 2.26(9.8) = 3.7 N

b. 2.26(2.64 x 9.8) = 58.5 N

Physics 2018-2019 (4 decks)

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