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 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

2 / 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

3 / 10

Force and acceleration are ______________ related

directly

inversely

4 / 10

Acceleration and mass are ______________ related

directly

inversely

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

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

7 / 10

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

539 N

87.5 N

54 N

5.51 N

F_w = mg

m = 54 kg

g = 1.62 m/s²

F_w = (54)(1.62) = 87.48 N

8 / 10

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.

9 / 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

10 / 10

Which letter above represents friction?

Your score is

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Random 20 Questions from the Force Test Bank

20 - Forces Questions

1 / 20

What is the displacement of a spring that has a spring constant of 2000 N/m when a force of 500N is applied?

0.25 m

1000000 m

2.5 m

4 m

2 / 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

3 / 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

4 / 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

5 / 20

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 / 20

Force and acceleration are ______________ related

directly

inversely

7 / 20

Acceleration and mass are ______________ related

directly

inversely

8 / 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

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

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

11 / 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.

12 / 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

13 / 20

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

14 / 20

What is the minimum force required to start a 0.5 kg brick moving on a wood surface?

0 N

0.45 N

2.2 N

2.9 N

10.9 N

15 / 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.

16 / 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

17 / 20

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

18 / 20

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

Increases

Decreases

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 the parallel 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