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Physical Science Test - Chapter 5: Dynamics

Total questions: 65

Worksheet time: 1hrs 9mins

Name
Class
Date
1.
What is the unit of force?
a)
Kilogram
b)
Meter
c)
Pascal
d)
Newton
2.

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

3.
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. 
4.
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
5.
If an object is accelerating, then the forces acting on it must be:
a)
balanced
b)
unbalanced
c)
increasing
d)
zero
6.
Forces that are equal in magnitude but opposite in direction are:
a)
unbalanced
b)
balanced
c)
increasing
d)
decreasing
7.
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
8.
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. 
9.
If an object is accelerating, then the forces acting on it must be:
a)
balanced
b)
unbalanced
c)
increasing
d)
zero
10.

Who developed mathematical equations describing how forces affect motion?

a)

Aristotle

b)

Archimedes

c)

Galileo

d)

Newton

11.

Forces are scalar quantities because they have size and direction.

a)

True

b)

False

12.

Contact forces cause all observed changes in motion.

a)

True

b)

False

13.

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

a)

True

b)

False

14.

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

a)

True

b)

False

15.

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.

16.

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

a)

True

b)

False

17.

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.

18.

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

19.

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.

20.

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

21.

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

a)

True

b)

False

22.

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

a)

True

b)

False

23.

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

a)

True

b)

False

24.

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

a)

True

b)

False

25.

Friction acts only on objects in motion

a)

True

b)

False

26.

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

a)

True

b)

False

27.

Which letter represents "friction" on the diagram?

a)

A

b)

B

c)

C

d)

D

e)

E

28.

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

29.

Which object has the most inertia?

a)

a falcon

b)

an airplane

c)

a single bar of gold

d)

the planet Jupiter

30.

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

31.

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.

32.

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

33.

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

a)

True

b)

False

34.

Which letter on the diagram is "weight"?

a)

A

b)

B

c)

C

d)

D

e)

E

35.

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

36.

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

37.

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

38.

Tru or False, use the image to answer the question

a)

True

b)

False

39.

Which letter represents "air resistance" on the diagram?

a)

A

b)

B

c)

C

d)

D

e)

E

40.

Air resistance is a form of friction known as ______________.

a)

drag

b)

rolling

c)

kinetic

d)

static

41.

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.

42.

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

a)

drag

b)

inertia

c)

mass

43.

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

a)

weight

b)

surface area

c)

altitude

d)

mass

44.

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.

45.

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.

46.

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

47.

Use the image to answer the question

a)

3.8 N

b)

5.4 N

c)

4.3 N

d)

2.2 N

48.

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

49.
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
50.
The force of gravity acting on an object is the object's ______.
a)
Mass
b)
Matter
c)
Weight 
d)
Terminal velocity 
51.
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 
52.
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.
53.
Oil between machine parts would be an example of which type of friction?
a)
static
b)
sliding
c)
fluid
d)
rolling
54.

A soccer ball is sitting in the middle of a field. The ball will remain at rest until an outside force like a players foot or the wind acts upon it. Which of Newton's laws is represented by this?

a)

1st

b)

2nd

c)

3rd

55.

Think about pushing a shopping cart and a car. If you apply the same amount of force to both, the shopping cart will travel fast, but the car will hardly move. To move the car yo would need a larger force. Which of Newton's laws is being represented?

a)

1st

b)

2nd

c)

3rd

56.

Sally jumps on her trampoline. She exerts a force on the trampoline and the trampoline exerts an equal but opposite force back on Sally. This represents

a)

Law 1

b)

Law 3

c)

Law 2

57.
As mass increases, what happens to gravitational force?
a)
increases
b)
decreases
c)
stays the same
d)
i don't know
58.
What best describes the mass and weight of a person as they move around the universe?
a)
mass and weight changes
b)
Mass and weight stays constant
c)
weight remains constant, mass changes
d)
Mass stays constant, weight changes
59.
The force of gravity on Jupiter is a little more than 2 times the gravitational force on Earth. If an object has a mass of 50 kg and a weight of 490 N on Earth, what would be the object's approximate mass and weight on Jupiter?
a)
50 kg and 490 N
b)
100 kg and 490 N
c)
50 kg and 980 N
d)
100 kg and 980 N
60.
When only the force of gravity is acting on an object, we say that the object is in ___________________________.
a)
Terminal Velocity
b)
Free Fall
c)
Projectile motion
d)
Centripetal Force
61.
What force causes objects falling near Earth's surface to slow down?
a)
Gravity
b)
Air Resistance
c)
Centripetal Force
d)
Newtons
62.
If a bowling ball and a feather were dropped at the same time, in a room with no air resistance (vacuum), which object will hit the ground first?
a)
Bowling Ball
b)
Feather
c)
Both would hit at the same time
d)
Neither one would hit the ground because air is what pushing things down.
63.

All objects in free fall (and ignoring air resistance) accelerate towards the earth at 9.8 m/s/s.

a)

true

b)

false

64.

Please answer the question in the image.

4 lines
65.

Use the image to answer the question

4 lines

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