# Physics Midterm Exam Review Quiz

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Alexnahon
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Quizzes Created: 1 | Total Attempts: 227
Questions: 18 | Attempts: 227

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A quiz to help review for the midterm exam.

• 1.

### Which of the following is a calculation of work?

• A.

Work (j) = Forece (N) x distance (m)

• B.

Work (j) = Forece (N) / distance (m)

• C.

Work (N) = Forece (j) x distance (m)

• D.

Work (N) = Mass (kg) x Gravity x Height (m)

• E.

Both 'A' and 'D' are correct.

E. Both 'A' and 'D' are correct.
Explanation
Answer A will provide work while not going against gravity, say sliding a book on a table.
Answer B will provide work while going against gravity, like sliding a book up a ramp.

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• 2.

### In the image above, what hand does more work.

• A.

A

• B.

B

• C.

C

• D.

A & B are equal and are greater than C

• E.

No work is done using these three forces.

C. C
Explanation
Force C will do the most work because it is entirely in the direction of the motion.

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• 3.

### Alexander has a mass of 70 kilograms. HIs apartment is on the second floor, 5 meters up from ground level. How much work does he do against gravity each time e clims the stairs to his apartment?

• A.

70N

• B.

9.8N

• C.

5m

• D.

686N

• E.

None of the above

D. 686N
Explanation
W=FD
W=70kg x 9.8m/s/s
W=686N

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• 4.

### Power is measure in _______, because the man who invented the steam engine was named ______ _____.  Power (P) is equal to ______ ______ by ______.

• A.

Joules; James Joule; mass; multiplied; distance

• B.

Newtons; Isaac Newton; time; multiplied; distance

• C.

Newtons; Isaac Newton; mass; divided; distance

• D.

Kilograms; Ken Kilo; work; divided; time

• E.

Watts; James Watts; work; divided; time

E. Watts; James Watts; work; divided; time
Explanation
Answer E is the only choice that correctly fills in all of the blanks.
Choice D is wrong because of the measurement of power and because of the name of the inventor.

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• 5.

### What is a device with moving parts that work together to accomplish a task?

• A.

Gear

• B.

Pulley

• C.

Machine

• D.

Wheel and axel

• E.

Lever

C. Machine
Explanation
Answer C is the only option that applies here. Answers A, B, D, and E are all example of C.

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• 6.

### In a machine, the ______ ______ in newtons, or the force that the machine applies to what you are trying to move, divided by the _____ _____ in newtons, or the force you apply to the machine, is known as the ______ ______ of the machine.

• A.

Input force; output force; work done

• B.

Input force; output force; power used

• C.

Output force; input force; work done

• D.

Output force; input force; power used

• E.

Output force; input force; mechanical advantage

E. Output force; input force; mechanical advantage
Explanation
Answers A & B are incorrect because of the order of forces (both list input then output, but the question calls for output then input). All choices that list work done or power used are incorrect because of these words. This leaves choice C as the only correct answer.

NOTE THAT THIS DOES NOT APPLY TO LEVERS OR GEARS OR RAMPS

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• 7.

### The _____ _____ of a machine can never be _____ than the ______ ______. When you design a machine that multiplies force, you pay by having to apply the force over a ______ distance.

distance, greater, input, output, work, work, force, force, initial, final, greater
Explanation
The output work of a machine can never be greater than the input work. When you design a machine that multiplies force, you pay by having to apply the force over a greater distance.

Nature does not give something for nothing. You cannot get more than what you have.

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• 8.

• 9.

• 10.

### The force in a rope is called the ____.

mechanical advantage, output work, force, tension, height, teeth
Explanation

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• 11.

• 12.

• 13.

• 14.

### When we measure how close to perfect a machine is, we are measuring its _____.

length, complexity, friction, mechanical advantage, electricity, efficiency, type, class, joule
Explanation
Efficiency is how close to perfect a machine is.

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• 15.

• 16.

### Any process that is not 100% efficient is ___________

impossible, irreversible, reversible
Explanation
Because some energy cannot get back into potential or kinetic energy, any process with less than 100% efficiency is irreversible.

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• 17.

• 18.

### A simple machine has a mechanical advantage of 5. If the output force is 10N, what is the input force?

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• Current Version
• Mar 21, 2023
Quiz Edited by
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• Dec 04, 2009
Quiz Created by
Alexnahon

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