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Weight, Friction, and Equlibrium

Total questions: 28

Worksheet time: 15mins

Name
Class
Date
1.

When all forces on an object are balanced

a)

weight

b)

equilibrium

c)

mass

d)

heat

e)

g

2.

The force of gravity on an object

a)

weight

b)

equilibrium

c)

mass

d)

heat

e)

g

3.

The acceleration of gravity

a)

weight

b)

equilibrium

c)

mass

d)

heat

e)

g = 9.81 m/s^2

4.

The product of friction

a)

weight

b)

equilibrium

c)

mass

d)

heat

e)

g = 9.81 m/s^2

5.

The measure of the matter in an object

a)

weight

b)

equilibrium

c)

mass

d)

heat

e)

g = 9.81 m/s^2

6.

Resistance of a fluid on an object

a)

rolling friction

b)

air friction

c)

viscous friction

d)

sliding friction

e)

friction

7.

Resistance of air pushing against an object

a)

rolling friction

b)

air friction

c)

viscous friction

d)

sliding friction

e)

friction

8.

Resistance of two objects pushing (sliding) against each other

a)

rolling friction

b)

air friction

c)

viscous friction

d)

sliding friction

e)

friction

9.

Any force that resists motion

a)

rolling friction

b)

air friction

c)

viscous friction

d)

sliding friction

e)

friction

10.

Resistance of a ball or wheel

a)

rolling friction

b)

air friction

c)

viscous friction

d)

sliding friction

e)

friction

11.

When an astronaut lands on the moon, the astronaut's MASS is:

a)

the same

b)

less

c)

more

12.

When an astronaut lands on the moon, the astronaut's WEIGHT is:

a)

the same

b)

less

c)

more

13.

When an astronaut lands on the moon, the astronaut's INERTIA is: (Hint: Inertia is equivalent to mass)

a)

the same

b)

less

c)

more

14.

Pushing a cart down the hall, when you try to turn it, it tries to go straight. Which law best applies?

a)

1st Law (Inertia)

b)

2nd Law (F=ma)

c)

3rd Law (action-reaction)

15.

More acceleration takes more force. Which law best applies?

a)

1st Law (Inertia)

b)

2nd Law (F=ma)

c)

3rd Law (action-reaction)

16.

When you push your knuckles into a table, it hurts your knuckles. Which law best applies?

a)

1st Law (Inertia)

b)

2nd Law (F=ma)

c)

3rd Law (action-reaction)

17.

A ball thrown into the ground bounces back up. Which law best applies?

a)

1st Law (Inertia)

b)

2nd Law (F=ma)

c)

3rd Law (action-reaction)

18.

A ball thrown into the ground bounces back up. Which law best applies?

a)

1st Law (Inertia)

b)

2nd Law (F=ma)

c)

3rd Law (action-reaction)

19.

Using g = 9.81 m/s^2, find the weight of a 4 kg object. (Hint: weight is force)

a)

39.2 N

b)

39.2 kg

c)

2.45 N

d)

0.40 N

20.

Two boys push on a box with a 3 N and 6 N to the right. The net force is 7 N. Find the force of friction.

a)

2 N

b)

9 N

c)

7 N

d)

16 N

21.

An object weight 350 N. Find its mass. Use g = 9.8 m/s^2

a)

66 kg

b)

35.7 kg

c)

0.02 kg

22.

A car's engine pushes with 45 N to the right. If it is at equilibrium, how much friction is there?

a)

45 N

b)

0 N

c)

90 N

d)

20 N

23.

If 100 kg person weight 400 N on the planet Zorg, what is the acceleration due to gravity on Zorg?

a)

4000 N

b)

4 m/s^2

c)

4 N

d)

0.04 m/s^2

24.

A 25 kg object accelerates at 5 m/s^2. Find the force.

a)

125 N

b)

5 N

c)

0.2 N

25.

A sled pushed with 30 N and sliding friction is 10 N. Find the net force on the sled.

a)

20 N

b)

30 N

c)

10 N

d)

15 N

26.

A boat's motor pushes with 25 N of force and viscous friction resists with 5 N. If the boat is 100 kg. Find its acceleration. (Hint: solve for net force, then acceleration)

a)

0.20 m/s^2

b)

5 m/s^2

c)

4 m/s^2

d)

20 m/s^2

27.

35 N is pulling to the left and friction opposes with 15 N. Find the net force.

a)

50 N right

b)

50 N left

c)

20 N right

d)

20 N left

28.

Find the weight of a 3 kg mass. g = 9.8 m/s^2

a)

29.4 N

b)

3.2 N

c)

0.30 N

d)

29.4 kg