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Chapter 5 Review - Dynamics

Total questions: 82

Worksheet time: 3hrs 44mins

Name
Class
Date
1.
In a tug of war the left team pulls with a force of 200N. The right team pulls with a force of 150N.What is the resultant force?
a)
50N to the left.
b)
350N to the left.
c)
350N to the right.
d)
50N to the right.
2.
What is the net force?
a)
400 N Up
b)
400 N Down
c)
- 400 N Down
d)
800 N Down
3.
What is the unit of force?
a)
Kilogram
b)
Meter
c)
Pascal
d)
Newton
4.

IF AN OBJECT REMAINS AT CONSTANT SPEED IN THE SAME DIRECTION, THAN THE FORCES ARE KNOWN TO BE:

a)

BALANCED

b)

UNBALANCED

c)

INCREASING

d)

DECREASING

5.
How will this object move? 
a)
It won't move. 
b)
It will move to the right. 
c)
It will move to the left. 
d)
It will move up. 
6.
The force needed to move an object depends upon:
a)
the mass of the object
b)
the volume of the object
c)
the density of the object
d)
the shape of the object
7.
If an object is accelerating, then the forces acting on it must be:
a)
balanced
b)
unbalanced
c)
increasing
d)
zero
8.
Forces that are equal in magnitude but opposite in direction are:
a)
unbalanced
b)
balanced
c)
increasing
d)
decreasing
9.
A block is pushed from four sides with forces of different magnitude, as shown in the picture. In which direction will the block move?
a)
east
b)
west
c)
north
d)
south
10.
How will this object move? 
a)
It won't move. 
b)
It will move to the right. 
c)
It will move to the left. 
d)
It will move in both directions. 
11.
If an object is accelerating, then the forces acting on it must be:
a)
balanced
b)
unbalanced
c)
increasing
d)
zero
12.
Forces that are equal in magnitude but opposite in direction are:
a)
unbalanced
b)
balanced
c)
increasing
d)
decreasing
13.
The force needed to move an object depends upon:
a)
the mass of the object
b)
the volume of the object
c)
the density of the object
d)
the shape of the object
14.

Who developed mathematical equations describing how forces affect motion?

a)

Aristotle

b)

Archimedes

c)

Galileo

d)

Newton

15.

Forces are scalar quantities because they have size and direction.

a)

True

b)

False

16.

Contact forces cause all observed changes in motion.

a)

True

b)

False

17.

Field forces grow stronger with distance from the source, but contact forces do not change with distance.

a)

True

b)

False

18.

Balanced forces cause an object, if it is in motion, to maintain its motion.

a)

True

b)

False

19.

How can you tell when the forces acting on a system are balanced?

a)

There is no motion.

b)

There is no displacement.

c)

There is no acceleration.

20.

A microscopic organism like a protozoan can exert a gravitational force.

a)

True

b)

False

21.

Which of the following is the result of a contact force?

a)

A ball thrown into the air falls down to the ground.

b)

Two magnetic compass needles repel each other.

c)

A hammer drives a nail into a piece of wood.

d)

Your hair stands on end, when you are touching a Van de Graaff generator.

22.

Which of the following fundamental forces is comparatively the weakest?

a)

the strong nuclear force

b)

the weak nuclear force

c)

the electromagnetic force

d)

the gravitational force

23.

Which of the following is the result of a force field?

a)

An apple press squeezes out apple cider.

b)

An airplane is jostled around because of wind shear.

c)

Girls win against boys in tug-of-war.

d)

When you jump into the air, you land on the ground.

24.

A piano suspended from a rope that goes through a pulley begins to fall. What is the largest force acting on the piano?

a)

pull of the rope

b)

pull of gravity

c)

the forces are equal

d)

none of these

25.

Balanced forces cause an object, if it is in motion, to maintain its motion.

a)

True

b)

False

26.

According to Newton’s first law, only external forces acting on an object can cause it to accelerate.

a)

True

b)

False

27.

Newton’s first law describes an object’s motion when no net forces are exerted on it.

a)

True

b)

False

28.

If the mass of a system is constant, its acceleration will change when the force exerted on it changes.

a)

True

b)

False

29.

Newton’s third law applies to all objects regardless of their condition of motion.

a)

True

b)

False

30.

Friction acts only on objects in motion

a)

True

b)

False

31.

A sled sliding down a hill experiences less friction than the same sled stopped at the bottom of the hill.

a)

True

b)

False

32.

Static and kinetic friction are directly proportional to the force pressing the systems into contact.

a)

True

b)

False

33.

The less mass an object possesses, the more inertia it has.

a)

True

b)

False

34.

Which letter represents "friction" on the diagram?

a)

A

b)

B

c)

C

d)

D

e)

E

35.

Who developed mathematical equations describing how forces affect motion?

a)

Aristotle

b)

Archimedes

c)

Galileo

d)

Newton

36.

How can you tell when the forces acting on a system are balanced?

a)

There is no motion.

b)

There is no displacement.

c)

There is no acceleration.

37.

In which case are all the forces acting on a system balanced? (Systems are underlined.)

a)

a baseball hit into left field

b)

a forklift lifting a pallet

c)

a meteorite that is falling through the earth's atmosphere and has reached its terminal velocity

d)

a baker stirring a bowl of chocolate cookie dough

38.

Which object has the most inertia?

a)

a falcon

b)

an airplane

c)

a single bar of gold

d)

the planet Jupiter

39.

A wrecking ball strikes a brick wall. Which of the following would increase the force of the ball?

a)

increasing the mass of the wrecking ball

b)

slowing down the wrecking ball

c)

decreasing the mass of the wrecking ball

d)

decreasing the thickness of the brick wall

40.

Which situation does not involve friction?

a)

a ball rolling down a hill

b)

a man walking on an even surface

c)

a raindrop sliding down a window

d)

an object free of gravitational pull

41.

Why are hot air balloons floating at a constant altitude not in free fall?

a)

The balloons are light enough that the gravitational force is zero.

b)

Forces on the balloons are balanced.

c)

The balloons are far enough from the earth to be unaffected by gravity.

d)

The balloons are not subject to air resistance.

42.

The SI unit of force is the ______________.

a)

gram

b)

newton

c)

ampule

43.

The tendency of matter to resist a change in motion until acted on by an external force is known as ______________.

a)

static

b)

kinetic

c)

inertia

d)

mass

44.

A car stopped on a hill experiences ______________ friction.

a)

static

b)

kinetic

c)

rolling

d)

fluid

45.

A sled sliding down a hill experiences ______________ friction.

a)

kinetic

b)

static

c)

fluid

d)

rolling

46.

A rotating bicycle tire experiences ______________ friction.

a)

kinetic

b)

static

c)

rolling

d)

fluid

47.

A sea turtle swimming against a current experiences ______________ friction.

a)

static

b)

kinetic

c)

rolling

d)

fluid

48.

During the stratospheric freefall, what did you notice about his speed as he was going through the two layers of atmosphere? When was he at his maximum speed? Why do you think he slowed down? Discuss this with your group and write 2 - 3 sentences about the stratospheric freefall towards Earth.

4 lines
49.

True or False: A micro-biotic organism has a gravitational pull?

a)

True

b)

False

c)

I don't know

50.

The gravitational force between the sun and the earth is dependent on the square of the distance between their surfaces.

a)

True

b)

False

51.

Why do you think that if you throw a penny off of the empire state building that it would not hurt the person below it (or maybe it would?)? Discuss this with your partner and answer in two sentences.

4 lines
52.

Now, if you threw a penny off of the empire state building without any air, what would happen to the penny and the person you hit with the penny at the bottom of the empire state building. Answer in two to three sentences?

4 lines
53.

Which letter on the diagram is "weight"?

a)

A

b)

B

c)

C

d)

D

e)

E

54.

What happened at time 0.0 s?

a)

The object hits the ground.

b)

The object is dropped.

c)

Velocity increases.

d)

Velocity decreases

e)

0.10 seconds

55.

What happens to the object's speed as it falls?

a)

The object hits the ground

b)

The object is dropped

c)

Velocity increases

d)

Velocity decreases

e)

0.10 seconds

56.

What happens at time 3.34 s?

a)

The object hits the ground.

b)

The object is dropped.

c)

Velocity increases.

d)

Velocity decreases.

e)

0.10 seconds

57.

Tru or False, use the image to answer the question

a)

True

b)

False

58.

Which letter represents "air resistance" on the diagram?

a)

A

b)

B

c)

C

d)

D

e)

E

59.

Air resistance is a form of friction known as ______________.

a)

drag

b)

rolling

c)

kinetic

d)

static

60.

The SI unit of force is the ______________.

a)

gram

b)

newton

c)

ampule

61.

If all objects exert gravitational attraction on each other, then why doesn’t all matter clump together?

a)

Gravitational attraction cannot overcome friction and other forces.

b)

The distances between objects are too small.

c)

Most matter is too cold.

d)

Most matter is moving too quickly.

62.

An object’s weight is directly proportional to its ______________ and gravitational acceleration.

a)

drag

b)

inertia

c)

mass

63.

Air resistance on a falling object increases with increasing __________ of the object.

a)

weight

b)

surface area

c)

altitude

d)

mass

64.

A mountain climber falters on a steep slope and slides down until his safety harness catches, pulling his rope taut. Why does he stop sliding?

a)

There is lower gravity due to higher altitude

b)

The tension on the rope is greater than gravity.

c)

The cold temperature slows his fall.

65.

Why are hot air balloons floating at a constant altitude not in free fall?

a)

The balloons are light enough that the gravitational force is zero.

b)

Forces on the balloons are balanced.

c)

The balloons are far enough from the earth to be unaffected by gravity.

d)

The balloons are not subject to air resistance.

66.

Galileo tested Aristotle’s theory of gravity by actual experiments dealing with __________.

a)

balls on wooden ramps

b)

dropped weights

c)

air resistance

d)

a feather and a hammer

67.

Which of the following are not directly proportional?

a)

weight and mass

b)

speed and distance traveled

c)

distance and gravitational attraction

d)

mass and gravitational attraction

68.

Which of the following fundamental forces is comparatively the weakest?

a)

the strong nuclear force

b)

the weak nuclear force

c)

the electromagnetic force

d)

the gravitational force

69.

Use the image to answer the question

a)

3.8 N

b)

5.4 N

c)

4.3 N

d)

2.2 N

70.

Use the image to answer the question. Multiple answers may be selected

a)

Mass of object 1

b)

Mass of object 2

c)

distance between their centers

d)

None of these are true

71.

Use the image to answer the question

4 lines
72.
What is the SI unit used to measure weight? 
*remember the definition of weight! 
a)
Grams 
b)
Liters
c)
Pounds 
d)
Newtons 
73.
What are the two factors effecting the magnitude of the force of gravity between 2 objects?
a)
Mass and Distance 
b)
Mass and Matter
c)
Distance and Weight 
d)
Weight and Mass
74.
The force of gravity acting on an object is the object's ______.
a)
Mass
b)
Matter
c)
Weight 
d)
Terminal velocity 
75.
What is the force acting between any two objects in the known universe all the time?
a)
Gravitational Force 
b)
Force of Friction 
c)
Normal Force 
d)
Electromagnetic Force 
76.
As distance between two objects increase the pull of gravity 
a)
Increases
b)
Decreases
c)
Stays the same
77.
As the product of two objects' masses increases, the pull of gravity
a)
Increases
b)
Decreases
c)
Stays the same
78.
Why do you think an astronaut weighs less on the moon than on Earth?
a)
The astronaut weighs less because the astronaut has less mass on the moon. Since the astronaut has less mass, the less the gravitational pull is exerted.
b)
The moon has less mass than the Earth. Thus, the moon exerts a less gravitational pull against the astronaut compared to the Earth. In turn, the astronaut weighs less on the moon than on Earth.
c)
The astronaut weighs less on the moon than the Earth because the astronauts mass and weight change due to the differences in gravitational pull among the moon and the Earth.
d)
The astronauts weight does not change, they are the same on the Earth, and the Moon.
79.
Friction is a force that acts in an ___________ direction of movement.
a)
similar
b)
opposite
c)
parallel
d)
west
80.
Which type of friction occurs when an object moves through a liquid or gas?
a)
sliding
b)
fluid
c)
static
d)
rolling
81.
Oil between machine parts would be an example of which type of friction?
a)
static
b)
sliding
c)
fluid
d)
rolling
82.
Objects balanced on Timmy's head would be an example of which type of friction?
a)
Rolling Friction
b)
Sliding Friction
c)
Fluid Friction
d)
Static Friction

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