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Unit III Force/Laws/Work/Power

Total questions: 40

Worksheet time: 53mins

Name
Class
Date
1.
What is the definition of "weight"?
a)
measure of the force of gravity on your body
b)
the time it takes to get on a ride 
c)
the amount of matter in an object
d)
the size of an object
2.
The weight of an object _________ as it moves away from the center of Earth.
a)
increases
b)
stays the same
c)
triples
d)
decreases
3.

Why do all of the planets orbit the sun rather than Earth?

a)

the sun has more mass

b)

the sun is a star

c)

the Earth is heavier

d)

the sun is in the middle of the milky way

4.

On which celestial object (outer space) would your mass be the greatest?

a)

Earth

b)

Jupiter

c)

Sun

d)

Your mass doesn't change on different celestial objects

5.

Convert 2500g to kg

a)

250kg

b)

2.5kg

c)

25kg

d)

0.25kg

6.

Convert 500g to kg

a)

5kg

b)

50kg

c)

5.0kg

d)

0.5kg

7.
A child has a mass of 30 Kg on Earth. If the gravity on Moon is one sixth that of the Earth what is the mass of the child on Moon? 
a)
30 Kg
b)
180 Kg
c)
5 Kg
d)
0 Kg
8.
Give both ways in which a force can be defined.
a)
a) A push and a lift
b)
b) A pull and a lift
c)
c) A push and a shove
d)
d) A push and a pull
9.

Give the units for a Force?

a)

a) J

b)

b) N

c)

c) Kg

d)

d) m

10.
Balanced or unbalanced?
a)
balanced
b)
unbalanced
11.
What will cause an object to move?
a)
Applied forces
b)
Balanced forces
c)
Unbalanced forces
12.
The sum of all forces acting on an object.
a)
Contact Force
b)
Balanced Force
c)
Unbalanced Force
d)
Net Force
13.
What is the net force?
a)
10 N
b)
0 N
c)
25 N
d)
1 N
14.
If a 10 kilogram object accelerates suddenly at 15 m/s^2, how much force was applied to the object?
a)
150 Newtons
b)
15 Newtons
c)
150 kilograms
d)
100 kilograms
15.
If an object was accelerating at 10 m/s^2, and a force of 10 newtons was required to accelerate it, what was the object's mass?
a)
1 kilogram
b)
10 kilograms
c)
2 kilograms
d)
5 kilograms
16.

A 20 kg bike accelerates at 10 m/s2. What was the force?

a)

25 Newtons

b)

20 Newtons

c)

200 Newtons

d)

10 Newtons

17.

Which has more Inertia? (and more force to move)

a)

Truck

b)

Ant

18.
Newton's 1st law is often called the _______.
a)
Newton's 2nd law
b)
action-reaction law
c)
law of equality
d)
law of inertia
19.
9.8 N/kg is the gravitational strength of which planet _________________?
a)
Mars
b)
Venus
c)
Mercury
d)
Earth
20.
A student has a mass of 65 kilograms.  What would be their weight on Earth?
a)
637 kilograms
b)
637 Newtons
c)
6.63 kilograms
d)
6.63 Newtons
21.
The gravitational strength on Neptune is 11.0 N/kg.  If the weight of a rover is 13,200 Newtons, what is the mass of it?
a)
145,200 grams
b)
145,200 kilograms
c)
1200 grams
d)
1200 kilograms
22.

According to Newton’s first law of motion, a moving object that is not acted on by an unbalanced force will...

a)

remain in motion.

b)

eventually come to a stop.

c)

change its momentum.

d)

accelerate.

23.

Which of the following is the formula for momentum?

a)

p = mv

b)

M = mv

c)

F = ma

d)

g = mc2

24.

Which of the following is the unit for momentum?

a)

kg·m/s

b)

kg·m

c)

kg·m/s2

d)

Momentum has no unit.

25.

Calculate the momentum of a 55-kg running back moving westward at 10 m/s.

a)

550 kg·m/s, west

b)

550 kg·m/s

c)

550 m/s, west

d)

550 kg, west

26.

Calculate the momentum of a 1200-kg truck moving northward at 30 m/s.

a)

36000 kg·m/s, north

b)

400 kg·m/s, north

c)

36000 kg·m/s

d)

400 kg·m/s

27.

With what velocity must a 0.48-kg softball be moving to equal the momentum of a 0.29-kg baseball moving at 23 m/s?

a)

13.9 m/s

b)

10.8 m/s

c)

16.7 m/s

d)

12.0 m/s

28.

Which of the following is the best example of work being done.

a)

doing homework

b)

lifting a box

c)

pushing a stationary box

d)

holding a box

29.

Which of the following would be an example of Work?

a)

13 W

b)

14 m

c)

45 J

d)

10 N

30.

A force of 100 N was necessary to lift a rock. A total of 150 J of work was done. How far was the rock lifted?

a)

1.5 M

b)

2.5 M

c)

2.0 M

d)

3.0 M

31.

It took 500 N of force to push a car 4 m. How much work was done?

a)

50 J

b)

1000 J

c)

1500 J

d)

2000 J

32.

It took 50 J to push a chair 5 m across the floor. With what force was the chair pushed?

a)

10 N

b)

20 N

c)

30 N

d)

40 N

33.

A young man exerted a force of 9,000 N on a stalled car but was unable to move it. How much work was done?

a)

25 J

b)

50 J

c)

75 J

d)

0 J

34.

You do 45 J of work in 3 seconds. How much power do you use?

a)

5 W

b)

10 W

c)

15 W

d)

20 W

35.

A 60 W light bulb runs for 5 seconds. How much energy does it use?

a)

100 J

b)

100 W

c)

300 J

d)

300 W

36.

A car uses 2,500 J in 25 s. What is the power of the car?

a)

15 W

b)

35 W

c)

75 W

d)

100 W

37.

You use 35 J of energy to move a 7 N object. How far did you move it?

a)

5 m

b)

15 m

c)

25 m

d)

30 m

38.

While walking up a flight of stairs 6 m you carry a 20 N bag of dog food. How much work was done?

a)

120 J

b)

80 W

c)

120 W

d)

80 J

39.

How much work was done after pushing a 3 N box for 10 minutes?

a)

0 J

b)

10 J

c)

100 J

d)

1000 J

40.

Parasol, a 3,000 kg satellite, revolves the Earth at a velocity of 8,000 m/s. What is its Momentum?

a)

2,400 kg x m/s

b)

240,000 kg x m/s

c)

2,400,000 kg x m/s

d)

24,000,000 kg x m/s

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