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

Which direction does an object accelerate?

Always directed up

Always directed down

Always directed the direction of the net force

Acceleration is always in the direction of the net force. If you push a box to the right, with an overall or net force to the right, the object will accelerate to the right.

2 / 10

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

0 m/s/s

9.8 m/s/s down

9.8 m/s/s up

No net force and no acceleration at terminal velocity

3 / 10

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)

4 / 10

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

5 / 10

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

5 m/s/s right

3 m/s/s left

5 m/s/s left

3 m/s/s right

6 / 10

Joe has a mass of 54 kg. What is his mass on the moon where the acceleration due to gravity is 1.62 m/s²?

539 kg

87.5 kg

54 kg

5.51 kg

Mass does not change. Weight does depending on the acceleration due to gravity.

7 / 10

How much force is required to keep an object in motion?

0 N

It's Weight

Depends on its mass

Newtons first law states an object in motion will stay in motion and an object at rest will stay at rest. No force is needed. Think of an asteroid in space

8 / 10

Which has more inertia?

0.34 kg ball

40 kg calf

80 kg boy

Mass is directly related to inertia. The more the mass the more the inertia

9 / 10

What type of friction do you have while an object is at rest?

Static

Kinetic

Rolling

Static Friction: at rest

Kinetic Friction: moving and can be sliding or rolling which would have a lower coefficient of friction than sliding.

10 / 10

What is the downhill force on a 4.0 kg object on a 25° Incline Plane?

0.41 N

4.0 N

16.6 N

35.5 N

Your score is

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Random 20 Questions from the Force Test Bank

20 - Forces Questions

1 / 20

Which direction does an object accelerate?

Always directed up

Always directed down

Always directed the direction of the net force

Acceleration is always in the direction of the net force. If you push a box to the right, with an overall or net force to the right, the object will accelerate to the right.

2 / 20

How much tension must be in a rope attached above an object if the normal force on a 500 N object is 100 N.

300 N up

200 N up

400 N up

600 N up

3 / 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

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 the air resistance force on a 1400 N skydiver at terminal velocity?

0 N

1400 N up

1400 N down

At terminal velocity net force is zero so air resistance must equal the skydivers weight or 1400 N but directed up

6 / 20

What is the mass of a 1400 N skydiver when she encounters 600 N of air resistance? (use g = 9.8 m/s/s)

13720 kg

143 kg

61.2 kg

81.6 kg

Find Mass

F_w = mg
m =F_w/g
m = 1400/9.8 = 143 kg

7 / 20

What is the net force when a 1400 N skydiver encounters 600 N of air resistance?

0 N

800 N down

800 N up

2000 N down

2000 N up

What is the net force when a 1400 N skydiver encounters 600 N of air resistance?

1400 N weight which is a vector directed down and mathematically -1400

600 N air resistance is opposite of motion so up and mathematically is +600

add the vectors together with their signs to get net force

-1400 + 600 = - 800 N or 800 N down

8 / 20

Force and acceleration are ______________ related

directly

inversely

9 / 20

Acceleration and mass are ______________ related

directly

inversely

10 / 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

11 / 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

12 / 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.

13 / 20

What would happen to your weight if you were on a planet with twice the acceleration due to gravity?

It would half

It would double

It would stay the same

It would quadruple

14 / 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)

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 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

17 / 20

What is the Normal force on a 4.0 kg object on a 25° Incline Plane?

0.41 N

4.0 N

16.6 N

35.5 N

18 / 20

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

Increases

Decreases

Larger incline means less force into the hill (equal to the magnitude of normal force) as more of the weight is going into the component downhill instead

19 / 20

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

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