Force Physics Practice

Get the force physics practice you need to get an A. Generate a 10 or 20 question quiz from this unit and find other useful practice.

This is an extensive unit. For more specific force practice, follow this link to a list of unit sections. Each section will have a physics practice quiz at the bottom of the page.

Use our equation sheet for guidance on the force equations. This unit uses one dimensional section, force section, and trigonometry reminders section of the equation sheet.

Physics Equation Sheet

Random 10 Questions from the Force Test Bank

10 - Forces Questions

1 / 10

What is the tension in a rope suspending a 45 kg object? (use g = 9.8 m/s/s)

45 kg

441 N

0.218 N

221 N

Tension up would have the equal magnitude to the weight down

F_w = mg

F_w = (45)(9.8) = 441 N

2 / 10

What is the net force on a 5 kg object that has a force of 20 N applied to the right and 5 newtons applied to the left?

25 N right

15 N left

25 N left

15 N right

3 / 10

Which is the term for the molecules that make up an object.

mass

weight

Matter is composed of the atoms/molecules that make up an object

4 / 10

Which of Newton's Laws describes an objects resistance to a change in motion or rest?

Newton's First Law

Newton's Second Law

Newton's Third Law

Newtons First Law: Law of inertia

This is about a resistance to change in motion. An object at rest stays at rest and an object in motion stays in motion unless acted upon by an outside force.

Force applied equals the magnitude of force of friction in constant motion. If you find the force of friction (F_f), you know the Force applied (F_A)

5 / 10

What is the force required to keep a 0.5 kg brick in constant motion on a wood surface?

0 N

0.45 N

2.2 N

2.9 N

10.9 N

6 / 10

What is the frictional force of a moving object on a 4.0 kg object on a 25° frictionless Incline Plane that has a coefficient of friction with the object of 0.43?

12.3 N

15.3 N

16.6 N

35.5 N

Follow through step #5 above on how to determine friction

find the weight
use weight to determine the normal force
use normal force to determine frictional force

7 / 10

What is the acceleration of a moving object on a 4.0 kg object on a 25° Incline Plane that has a coefficient of friction with the object of 0.43?

0.325 m/s/s

0.56 m/s/s

4.15 m/s/s

11.5 m/s/s

First find the weight (F_w = mg)
Use the weight to find the parallel force down the hill
Use the weight to find the perpendicular force into the hill (also equal to the magnitude of normal force which will be used in the friction equation)
Use the normal force from the step above to figure out the force of friction (F_f = µF_n)
Find the net force (by finding the sum of the forces) subtracting friction uphill from the parallel force downhill
Use the net force in the equation (F_net=ma) to determine the acceleration

8 / 10

What happens to the downhill force as the angle of incline increases?

Increases

Decreases

Larger incline means more force downhill

9 / 10

Which letter above represents the parallel force?

10 / 10

Which letter above represents weight?

Your score is

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Random 20 Questions from the Force Test Bank

20 - Forces Questions

1 / 20

How much force is in a spring that has a spring constant of 4400 N/m that is displaced 0.03 m?

102 N

65 N

321 N

132 N

2 / 20

Solve for the tension in one of the ropes suspending the object above.

5.4 N

7.35 N

8.5 N

10.3 N

3 / 20

What is the tension in each of two ropes vertically suspending a 45 kg object? (use g = 9.8 m/s/s)

45 kg

441 N

0.218 N

221 N

Tension if a single rope would have the equal magnitude to the weight down. With two ropes both directed up, they are sharing the weight so divide by two.

F_w = mg

F_w = (45)(9.8) = 441 N

441/2 = 220.5 N

4 / 20

What is the weight of a 1400 N skydiver at terminal velocity?

0 N

1400 N up

1400 N down

The way the question was stated it was giving you weight which is a force (F_w = 1400 N)

5 / 20

What is net force of a 1400 N skydiver at terminal velocity?

0 N

1400 N up

1400 N down

At terminal velocity a person is no longer accelerating so net force is zero because air resistance force is equal to the weight force

6 / 20

Acceleration and mass are ______________ related

directly

inversely

7 / 20

What is the mass of an object that accelerates at 4 m/s when 20 N of net force is applied?

5 kg

80 kg

0.2 kg

2.0 kg

8 / 20

What is the net force in the picture above

7 N right

22 N right

8 N left

52 N left

30 left is -30
15 right is +15
7 right is +7

Add them together and turn the sign back into a direction (-30 + 15 + 7 = -8)

8 Newtons Left

9 / 20

What is the net force on a 5 kg object that has a force of 20 N applied to the right and 5 newtons applied to the left?

25 N right

15 N left

25 N left

15 N right

10 / 20

Net force causes _____________________. Pick the best answer

motion in the same direction

acceleration in the same direction

motion in the opposite direction

acceleration in the opposite direction

Net force causes an object to accelerate... not just move. Acceleration always occurs in the same direction as net force. If you are pushing something to the right with a greater force than friction, and its net force is to the right, it will accelerate to the right.

11 / 20

Which changes depending on your location?

mass

weight

Mass (kg) never changes because it is a measure of the matter that you are composed of. You are the same matter on earth or on the moon.

Weight (F_w) changes when g changes. g changes depending on your altitude on earth, in space, or on another planet (it is not always 9.8 m/s²which is why many classes use a more rounded 10 m/s²instead.

(F_w = mg)

12 / 20

Joe has a mass of 54 kg. What is his weight on the earth?

529 N

87.5 N

54 N

5.51 N

F_w = mg

m = 54 kg

g = 9.8 m/s²

F_w = (54)(9.8) = 529.2 N

13 / 20

Which statement is related to an objects inertia?

A cup sitting on a car slides off when you hit the breaks

A cup sitting on a windshield slides off because the surface is angled

A cup sitting on a car moves when you grab it

A cup is moving with the car and when you hit the breaks its inertia wants it to keep on going forward. Therefore the cup slides off because it wants to keep its state of motion.

14 / 20

What is the magnitude of net force when 162 N of force is required to keep an object in constant motion?

0 n

10 N

16.2 N

162 N

Constant motion means no acceleration. Net force (sum of overall forces on an object) must be zero if there is no acceleration.

15 / 20

What is the magnitude of frictional force when 162 N of force is required to keep an object in constant motion?

0 n

10 N

16.2 N

162 N

What is the magnitude of frictional force when 162 N of force is required to keep an object in constant motion?

If there is constant motion there is no acceleration and the net force is zero. The frictional force must equal the force applied in the opposite direction so 162 N as well

16 / 20

What happens to the frictional force as the angle of incline increases?

Increases

Decreases

17 / 20

What happens to the downhill force as the angle of incline increases?

Increases

Decreases

Larger incline means more force downhill

18 / 20

Which number above is where the incline angle would be placed?

19 / 20

Which letter above represents friction?

20 / 20

Which letter above represents normal force?

Your score is

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Resources

StickMan Physics Home Page
Force Content Page
Stickman Physics Table of Contents: Use the search bar or click here to easily find a unit or topic
Physics Equation Sheet: commonly used equations, variables, and units
Rule of Ones: analyzing equations to determine how other variables change
Holdensclass.com: Video walk-through of Many Physics Concepts