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Forces and Motion

Total questions: 58

Worksheet time: 33mins

Name
Class
Date
1.

What is a force?

a)

Something that characters from Star Wars have.

b)

An attraction between opposite magnetic poles.

c)

A push or a pull.

d)

Distance divided by time.

2.

Forces that are opposite in direction but not equal in size are...

a)

balanced forces

b)

unbalanced forces

c)

frictional forces

d)

catastrophic forces

3.

Balanced forces are...

a)

opposite in direction but not equal in size.

b)

not opposite in direction and not equal in size.

c)

opposite in direction and equal in size.

d)

forces that keep you standing up without falling over.

4.

What kind of forces do you have to have in order to have motion?

a)

Opposite

b)

Gravitational

c)

Balanced

d)

Unbalanced

5.

What unit is force measured in?

a)

Watts

b)

Joules

c)

Newtons

d)

m/s2

6.

The force exerted by every object in the universe on every other object is called _______________.

a)

friction

b)

work

c)

acceleration

d)

gravity

7.

The amount of gravitational force between two objects depends on what two things?

a)

The masses of the objects and the distance between them.

b)

The masses of the objects and their speed.

c)

The distance between the objects and how large they are.

d)

The friction between the objects and the distance between them.

8.

You have two satellites of equal mass orbiting the Earth. Satellite A is 150 miles above the Earth, and satellite B is 200 miles above the Earth. Upon which one will the pull of Earth's gravity be greater?

a)

Satellite A

b)

Satellite B

9.

A satellite with a mass of 1,000 kg and an asteroid with a mass of 50,000 kg are both 300 miles from the Earth. Upon which object is the pull of Earth's gravity greater?

a)

the satellite

b)

the asteroid

10.

Why are all planets and stars spheres?

a)

Because a spherical shape gives planets and stars less friction as they fly through space.

b)

Because square planets and stars would look dumb.

c)

Because, since gravity pulls toward the center of an object equally in all directions, the only shape that you can have is a sphere.

d)

Because the acceleration due to gravity is different on all planets.

11.

The ranking of the planets of our solar system from most to least massive is as follows: Jupiter, Saturn, Neptune, Uranus, Earth, Venus, Mars, Mercury, and Pluto. On which planet would your mass be greatest?

a)

On Jupiter. It has the biggest mass, so its pull of gravity would make you have the greatest mass there.

b)

On Pluto. It has the biggest mass, so its pull of gravity would make you have the greatest mass there.

c)

On Pluto. It has the smallest mass, so its pull of gravity would make you have the greatest mass there.

d)

None. Since you're made of the same amount of matter no matter where you are, you'd be the same mass on any planet.

12.

On which planet would you weigh the most?

a)

On Jupiter. It's biggest, so it has the biggest pull of gravity.

b)

On Pluto. It's biggest, so it has the biggest pull of gravity.

c)

On Pluto. It's smallest, so it has the smallest pull of gravity.

d)

None. Your weight never changes, regardless of where you are.

13.

What is the acceleration due to gravity?

a)

741 miles per hour

b)

9.8 m/s2

c)

300,000 kilometers per second

d)

Faster than Usain Bolt can run.

14.

You drop a miniature mouse and a huge hippopotamus off the roof of the school. Which will hit the ground first?

a)

The mouse, because it has less mass.

b)

The hippo, because it has more mass.

c)

The mouse, because it has less air resistance.

d)

They hit the ground at the same time, because all objects, regardless of mass, fall at the same rate.

15.

You drop a flat sheet of paper and a balled-up sheet of paper of the same size from the same height at the same time. Which will hit the ground first?

a)

The flat sheet will hit the ground first because it has more surface area.

b)

The balled-up paper will hit the ground first because it has more mass.

c)

They both hit the ground at the same time, because all objects fall at the same rate.

d)

The balled-up piece of paper will hit the ground first, because it has less surface area, so there's less air resistance to slow it down.

16.

A force that opposes the motion between two surfaces that are in contact is ...

a)

gravity

b)

friction

c)

momentum

d)

work

17.

Which picture is an example of static friction?

a)
b)
c)
d)
18.

Which picture is an example of sliding friction?

a)
b)
c)
d)
19.

Which picture is an example of fluid friction?

a)
b)
c)
d)
20.

Which picture is an example of rolling friction?

a)
b)
c)
d)
21.

_______________ is a change of position.

a)

Force

b)

Work

c)

Power

d)

Motion

22.

Which of Newton's Laws of Motion relates the force acting on an object to the object's mass and how it accelerates?

a)

1st

b)

2nd

c)

3rd

d)

365th

23.

Which of Newton's Laws says that "for every action there's an equal and opposite reaction"?

a)

1st

b)

2nd

c)

3rd

d)

0th

24.

Which of Newton's Laws says that "an object at rest stays at rest, and an object in motion stays in motion, unless acted on by a force"?

a)

1st

b)

2nd

c)

3rd

d)

4th

25.

Why do we wear seatbelts when riding in a car?

a)

So you don't get a ticket.

b)

Because the seat belt will stop your inertia from throwing you out of the car if you get in an accident.

c)

To stop gravity from throwing you out of the car if you get in an accident.

d)

Because the power of the car will throw you backward if you get in an accident.

26.

Which of Newton's Laws best explains this situation?


A car sitting motionless at a stop light.

a)

1st

b)

2nd

c)

3rd

27.

Which of Newton's Laws best explains this situation?


A swimmer pushes backward on the water with their arms and legs, and the water pushes the swimmer forward.

a)

1st

b)

2nd

c)

3rd

28.

Which of Newton's Laws best explains this situation?


You kick a soccer ball, and the ball pushes back against your foot.

a)

1st

b)

2nd

c)

3rd

29.

Which of Newton's Laws best explains this situation?


It takes more force to throw a football than it takes to throw a ping pong ball with the same acceleration.

a)

1st

b)

2nd

c)

3rd

30.

Which of Newton's Laws best explains this situation?


You hit a baseball, and it keeps going, and going, and going...

a)

1st

b)

2nd

c)

3rd

31.

Which of Newton's Laws best explains this situation?


If you push on a bicycle and a school bus with the same force, the bicycle will accelerate faster.

a)

1st

b)

2nd

c)

3rda

32.

If you push or pull on an object and it moves, you've done _______________.

a)

something good for humanity

b)

an exercise in acceleration

c)

an example of balanced forces

d)

work

33.

What's the formula for calculating work?

a)

W=dtW=\frac{d}{t}

b)

W=fxdW=fxd

c)

W=vf−vitW=\frac{v_f-v_i}{t}

d)

a2+b2=c2a^2+b^2=c^2

34.

What unit is work measured in?

a)

Watts

b)

m/s

c)

Joules

d)

Pandas

35.

You use 12 N of force to push a sloth on a skateboard a distance of 6 meters. How much work have you done?

a)

Sloths are gross.

b)

2 Joules

c)

.5 Joules

d)

72 Joules

36.

You pull on a walrus using 90 Newtons of force, but you can't move the massive beast. How much work have you done?

a)

900 Joules

b)

0 Joules

c)

9.8 Joules

d)

729.0 x 105 Joules

37.

What is power?

a)

How much weight you can bench press.

b)

Force x distance

c)

The rate at which work is done.

d)

The rate of change of motion

38.

What's the formula for calculating power?

a)

p=fxdp=fxd

b)

p=dtp=\frac{d}{t}

c)

p=Wtp=\frac{W}{t}

d)

p=vf−vitp=\frac{v_f-v_i}{t}

39.

What unit is power measured in?

a)

Watts

b)

Joules

c)

Newtons

d)

Sweat and tears

40.

If you use 20 Newtons of force to run 100 meters in 10 seconds, what is your power?

a)

.5 Watts

b)

200 Watts

c)

20,000 Watts

d)

50 Watts

41.

What kind of simple machine does this picture show?

a)

lever

b)

wheel and axle

c)

pulley

d)

wedge

42.

What kind of simple machine does this picture show?

a)

inclined plane

b)

screw

c)

wheel and axle

d)

lever

43.

What kind of simple machine does this picture show?

a)

inclined plane

b)

pulley

c)

lever

d)

wedge

44.

What kind of simple machine does this picture show?

a)

lever

b)

screw

c)

wedge

d)

wheel and axle

45.

What kind of simple machine does this picture show?

a)

wedge

b)

pulley

c)

lever

d)

wheel and axle

46.

What kind of simple machine does this picture show?

a)

lever

b)

pulley

c)

screw

d)

wheel and axle

47.

A change of position is _______________.

a)

speed

b)

acceleration

c)

motion

d)

positionality

48.

What is speed?

a)

Deeps spelled backwards.

b)

The rate of motion.

c)

The rate at which gravity pulls objects to the center of the Earth.

d)

A push or a pull.

49.

What two things do you need to calculate speed?

a)

mass and distance

b)

time and mass

c)

distance and time

d)

a brain and a calculator

50.

What's the formula for calculating speed?

a)

s=fxds=fxd

b)

s=dts=\frac{d}{t}

c)

s=tds=\frac{t}{d}

d)

s=vf−vits=\frac{v_f-v_i}{t}

51.

What is the unit for speed?

a)

m/s2

b)

J

c)

N

d)

m/s

52.

A shark swims 36 meters in 9 seconds. What is its speed?

a)

324 m/s

b)

.25 m/s

c)

4 m/s

d)

Fast enough to catch and eat you!

53.

The speed of an object in a particular direction is __________.

a)

velocity

b)

acceleration

c)

momentum

d)

gravity

54.

The rate of change of velocity is _________________.

a)

acceleration

b)

momentum

c)

friction

d)

speed

55.

What's the unit for acceleration?

a)

light years

b)

Newtons

c)

m/s

d)

m/s2

56.

What's the formula for calculating acceleration?

a)

s=dts=\frac{d}{t}

b)

a=Wta=\frac{W}{t}

c)

a=vf−vita=\frac{v_f-v_i}{t}

d)

a=vi−vfta=\frac{v_i-v_f}{t}

57.

Turbo the racing snail goes from 6 m/s to 16 m/s in 2 seconds. What is his blindingly fast acceleration?

a)

96 m/s2

b)

5 m/s2

c)

-5 m/s2

d)

8 m/s2

58.

How are you feeling right now?

a)

Tired!

b)

My brain hurts!

c)

I need candy!

d)

All of the above.

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