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Forces Trivia Quiz

There are many types of forces in physics. Let's see how much you know about them.

A multiple-choice quiz by hotdogPi. Estimated time: 4 mins.

Author
hotdogPi

Time
4 mins

Type
Multiple Choice

Quiz #
372,289

Updated
Dec 03 21

# Qns
10

Difficulty
Average

Avg Score
7 / 10

Plays
692

Last 3 plays: genoveva (10/10), samak (8/10), Guest 104 (5/10).

One at a Time - Single Page - Timed Game

Question 1 of 10

1. If an object is in free fall, what is the only force that is acting upon that object? Hint

Normal force

There is no force acting upon it

Applied force

Gravity

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Question 2 of 10

2. If an object is at rest on a flat surface, there is always gravity pulling down and the normal force pushing up. Which force is greater? Hint

Gravity

Depends on the object

Normal force

They are equal

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Question 3 of 10

3. What unit is used to measure forces? Hint

Kilograms

Skywalkers

Meters per second squared

Newtons

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Question 4 of 10

4. Which of these is NOT usually considered tension when a force is applied to its ends? Hint

Wire

String

Spring

Rope

5. The coefficient of friction is a number that measures friction. It is not constant; it depends on what the two surfaces are. Usually the number will be between 0.1 and 1, although values outside this range can exist. Which Greek letter is used for this value? Hint

Lambda

Theta

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Question 6 of 10

6. If an object is on a sloped surface of 45 degrees, in which direction is the normal force? Hint

Parallel to the surface

Straight down

Straight up

Perpendicular to the surface

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Question 7 of 10

7. Which of these would NOT be considered an applied force? Hint

Pulling a string

Pushing a chair

Energy

Pushing the wall in front of you

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Question 8 of 10

8. If a 30 kg bicycle, a 400 kg car, and a 5000 kg train are all traveling at 10 m/s at a specific time, and they don't accelerate or brake, which one will have the greatest frictional force acting upon it? Assume that the coefficient of friction is the same for all three vehicles. Hint

The train

The bicycle

The car

They are all the same

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Question 9 of 10

9. Force is equal to mass times which of these? Hint

Inertia

Velocity

Acceleration

Weight

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Question 10 of 10

10. Theoretically, if there were no forces acting on an object, and the object was moving in a particular direction at 5 m/s, what would eventually happen? Hint

The object would gradually speed up

The object would gradually slow down and come to a stop

The object would move at 5 m/s indefinitely

The object would immediately stop moving

Most Recent Scores

Dec 21 2024 : genoveva: 10/10
Dec 03 2024 : samak: 8/10
Nov 21 2024 : Guest 104: 5/10
Nov 10 2024 : Guest 153: 7/10

Score Distribution

Quiz Answer Key and Fun Facts

1. If an object is in free fall, what is the only force that is acting upon that object?

Answer: Gravity

On Earth, gravity is acting on everything, even objects which are not falling. An object in free fall is not affected by any force other than gravity, and it has a constant acceleration of -9.8 m/s� (-32 ft/s�).

2. If an object is at rest on a flat surface, there is always gravity pulling down and the normal force pushing up. Which force is greater?

Answer: They are equal

If gravity was stronger, the object would be falling, and not at rest. If the normal force was stronger, the object would be ascending, which is impossible.

3. What unit is used to measure forces?

Answer: Newtons

One newton is defined as 1 kg�m/s�. Weight can be also be measured in newtons, since weight is a measure of the force of gravity on an object.

4. Which of these is NOT usually considered tension when a force is applied to its ends?

Answer: Spring

Tension is when a string, rope, wire, cable, or other similar object pulls on something. Spring force is different, and it is only used when there is a spring.

Answer: Mu

Mu does not have a unit, unlike other measurements, because Mu is the ratio between frictional force and the normal force. Since the units for forces cancel out, all that is left is a number. It could not be a coefficient if it had a unit to go along with it.

6. If an object is on a sloped surface of 45 degrees, in which direction is the normal force?

Answer: Perpendicular to the surface

The normal force is always perpendicular to the surface, no matter what the angle of the surface is. However, gravity, unlike the normal force, is always straight down, regardless of the slope of the surface.

7. Which of these would NOT be considered an applied force?

Answer: Energy

Applied force is defined as when a person pushes or pulls an object. If you push the wall in front of you, even though the wall will not move, an applied force is being acted upon the wall, and an equal force is pushing back at your hand.

Answer: The train

The coefficient of friction is the same for all three, so the frictional force is proportional to the normal force. The normal force is equal to the gravitational force, and the gravitational force (in newtons) is approximately ten times the mass (in kilograms) while on Earth. If the coefficient of friction is 0.2, friction will be 60 N on the bicycle, 80 N on the car, and 1000 N on the train.

9. Force is equal to mass times which of these?

Answer: Acceleration

This is Newton's Second Law. This formula means that a given force will accelerate a less massive object more than a more massive object. It also means that if the mass is greater, more force is needed to accelerate the object the same amount compared to a less massive object.

10. Theoretically, if there were no forces acting on an object, and the object was moving in a particular direction at 5 m/s, what would eventually happen?

Answer: The object would move at 5 m/s indefinitely

This is Newton's First Law. However, since gravity acts on everything, this is only a theoretical situation, and it could never actually happen. However, if all forces are equal and balanced, a moving object will continue moving at a constant velocity.

Source: Author hotdogPi

This quiz was reviewed by FunTrivia editor rossian before going online.
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