# Work, Power And Machines Trivia Quiz!

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| By Mrsdelo608
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Mrsdelo608
Community Contributor
Quizzes Created: 1 | Total Attempts: 248
Questions: 20 | Attempts: 248

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• 1.

### A leaf rake makes work easier by increasing the output force.

• A.

True

• B.

False

B. False
Explanation
A leaf rake makes work easier by increasing the output distance. A crowbar would make work easier by increasing the output force.

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• 2.

### You push on an object for 5 seconds.  During those 5 seconds, the object moves 0.87 m.  After you stop pushing, the object moves another 0.30 m.  The distance you should use to calculate work is ____________.

0.87m, 0.87 m, 0.87
Explanation
To find work, you only use the distance the object moved while force was applied.

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• 3.

### Kinetic and potential energy increase when you lift something in the air.

• A.

True

• B.

False

A. True
Explanation
When you lift something in the air, you are doing work against gravity. As a result, the object gains potential energy because it now has the ability to do work due to its elevated position. Additionally, as you lift the object, you are applying a force and causing it to move. This movement results in the object gaining kinetic energy, which is the energy of motion. Therefore, both the potential and kinetic energy of the object increase when it is lifted in the air.

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• 4.

### The formula to calculate power is work times distance.

• A.

True

• B.

False

B. False
Explanation
The formula to calculate power is work divided by time.

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• 5.

### Work can occur without motion.

• A.

True

• B.

False

B. False
Explanation
Motion must occur for work to be done.

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• 6.

### A machine converts input work into output work.

• A.

True

• B.

False

A. True
Explanation
The statement is true because a machine is designed to transform input work into output work. Machines use various mechanisms such as gears, levers, or pulleys to convert the energy supplied to them into useful work. This conversion can occur in different forms, such as mechanical, electrical, or thermal energy. Therefore, it is accurate to say that a machine converts input work into output work.

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• 7.

### One way a machine can make work easier is to change the direction of the force.

• A.

True

• B.

False

A. True
Explanation
This statement is true because machines such as pulleys, levers, and inclined planes can change the direction of the force applied to them. By changing the direction of the force, these machines can make it easier to perform work by reducing the amount of force required. For example, a pulley can allow a person to lift a heavy object by pulling downwards instead of upwards, reducing the effort needed. Similarly, a lever can amplify a small input force to lift a much heavier load on the other end. Therefore, changing the direction of force is one way machines can make work easier.

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• 8.

### A machine that has an output force that is equal to the input force has a mechanical advantage of less than one.

• A.

True

• B.

False

B. False
Explanation
The formula for mechanical advantage is output force over input force. Any number over itself is one.

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• 9.

### What does a machine do to the amount of work that needs to be done?

• A.

Decreases it

• B.

Increases it

• C.

Keeps it the same

• D.

Eliminates it

C. Keeps it the same
Explanation
A machine keeps the amount of work that needs to be done the same. This means that the machine does not decrease or increase the workload, but rather helps to maintain it at a consistent level. Machines are designed to assist in performing tasks more efficiently and effectively, but they do not eliminate the need for work altogether.

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• 10.

### According to scientists, which of the following are considered work?

• A.

• B.

Studying

• C.

Lifting weights

• D.

Moving a bookshelf

C. Lifting weights
D. Moving a bookshelf
Explanation
Lifting weights and moving a bookshelf are considered work because they involve exerting force to move an object against a resistance. Reading and studying, on the other hand, do not involve physical exertion or the application of force, so they are not considered work in the scientific sense.

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• 11.

### Work is done to lift an object off of the ground.

• A.

True

• B.

False

A. True
Explanation
When an object is lifted off the ground, work is indeed done. Work is defined as the transfer of energy that occurs when a force is applied to an object, causing it to move in the direction of the force. In this case, the force applied is against the force of gravity, and as the object is lifted, energy is transferred to it. Therefore, work is being done to lift the object off the ground.

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• 12.

### The efficiency of a machine is also a measure of

• A.

Friction

• B.

Accuracy

• C.

Work

• D.

Energy

A. Friction
Explanation
Efficiency is a measure of how well a machine converts input energy into useful output energy. Friction is a force that opposes motion and causes energy loss in a machine. Therefore, the efficiency of a machine is affected by the presence of friction. Higher friction leads to lower efficiency as more energy is wasted in overcoming the resistance caused by friction. Hence, friction is a valid measure of a machine's efficiency.

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• 13.

### Only the part of a force that acts in the direction of motion does work.

• A.

True

• B.

False

A. True
Explanation
This statement is true because work is defined as the product of the magnitude of the force and the displacement of the object in the direction of the force. If a force is acting perpendicular to the direction of motion, it will not contribute to the work done on the object. Only the component of the force that is parallel to the direction of motion will do work on the object. Therefore, only the part of a force that acts in the direction of motion does work.

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• 14.

### Moving something faster changes the amount of work done on the object in comparison to moving it in the same distance at a slower speed.

• A.

True

• B.

False

A. True
Explanation
When an object is moved faster, it covers the same distance in less time. This means that the work done on the object is done in a shorter amount of time, resulting in a greater amount of work done per unit of time. Therefore, moving something faster does indeed change the amount of work done on the object in comparison to moving it at a slower speed.

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• 15.

### The work done to lift an object off the ground is equal to the mass of the object multiplied by the distance it is lifted.

• A.

True

• B.

False

B. False
Explanation
The work done to lift an object off the ground is equal to the weight of the object multiplied by the distance it is lifted.

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• 16.

### Calculate the power used to move an object 3.0 m using 2 N of force over 2.5 seconds. (Hint: find work, then power) Work = Force x distance Power = Work/time

• A.

6 W

• B.

5 W

• C.

15 W

• D.

2.4 W

D. 2.4 W
Explanation
2 N x 3.0 m = 6 J
6 J/2.5 s = 2.4 W

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• 17.

### Pamela uses a nutcracker to break an walnut.  She applies a force of 24 N on the nutcracker.  The force exerted on the almond is 60 N.  Calculate the mechanical advantage of the nutcracker.MA = output force/input force

• A.

2.5

• B.

0.4

• C.

1,440

• D.

6

A. 2.5
Explanation
60 N/24 N = 2.5

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• 18.

### You push on an object for 4 seconds with a force of 3 N.  During those 4 seconds, the object moves 0.85 m.  After you stop pushing, the object moves another 0.10 m.  Calculate the work done on the object.  Work = Force x distance

• A.

3.4 J

• B.

2.55 J

• C.

2.85 J

• D.

3.8 J

B. 2.55 J
Explanation
3 N x 0.85 m

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• 19.

### Ross does 30 J of work with a lever.  The output work of the elver is 25 J.  Calculate the efficiency of the lever.Efficiency = output work/input work x 100

• A.

12%

• B.

8.3%

• C.

83%

• D.

120%

C. 83%
Explanation
25 J/30 J x 100 = 83%

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• Current Version
• Mar 20, 2023
Quiz Edited by
ProProfs Editorial Team
• May 09, 2016
Quiz Created by
Mrsdelo608

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