Force Physics Practice

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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

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

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 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

4 / 10

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

9.8 m/s/s

0 m/s/s

4.5 m/s/s

5.6 m/s/s

Find Net Force

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

Find Mass

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

Calculate acceleration

F_net= ma

a = F_net/m

a = 800/143 = 5.6 m/s²

5 / 10

What is the acceleration of a 1400 N skydiver that has no air resistance?

0 m/s/s down

9.8 m/s/s down

5 m/s/s down

6.4 m/s/s down

When air resistance on earth is ignored and an object is not too high up, the acceleration due to gravity is 9.8 m/s/s

6 / 10

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

7 / 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

8 / 10

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.

9 / 10

What is the weight of a 4.0 kg object on a 25° frictionless Incline Plane? (Use g = 9.8 m/s²)

0.41 N

4.0 N

9.8 N

39.2 N

10 / 10

Which letter above represents the parallel force?

Your score is

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Random 20 Questions from the Force Test Bank

20 - Forces Questions

1 / 20

What is the spring constant of a spring displaced 0.1 meters when 400 N of force is applied?

40 N/m

4000 N/m

384 N/m

10 N/m

2 / 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

3 / 20

What happens to the magnitude of force required to stretch a spring 0.1 m when the spring constant increases?

force must increase

force must decrease

force stays the same

4 / 20

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

5 / 20

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

6 / 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

7 / 20

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

9.8 m/s/s

0 m/s/s

4.5 m/s/s

5.6 m/s/s

Find Net Force

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

Find Mass

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

Calculate acceleration

F_net= ma

a = F_net/m

a = 800/143 = 5.6 m/s²

8 / 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

9 / 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

10 / 20

Force and acceleration are ______________ related

directly

inversely

11 / 20

Acceleration and mass are ______________ related

directly

inversely

12 / 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

13 / 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

14 / 20

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.

15 / 20

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

16 / 20

You use a spring scale to measure the amount of force required to first start an object moving. You would use this value to determine the coefficient of ___________ friction.

static

kinetic

Coefficient of static friction. The moment the object first starts moving is also almost equivalent to the maximum force provided by friction while the object was at rest or static.

17 / 20

Which is almost always greater

kinetic friction

static friction

rolling friction

When an object is at rest (static) the surfaces between objects are settled and closer together. With surfaces closer together there is more interaction and therefore more static friction friction than kinetic.

18 / 20

What is the weight of a 4.0 kg object on a 25° frictionless Incline Plane? (Use g = 9.8 m/s²)

0.41 N

4.0 N

9.8 N

39.2 N

19 / 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

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