Physics Midterm Exam Review Quiz

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

Joules; James Joule; mass; multiplied; distance

Newtons; Isaac Newton; time; multiplied; distance

Newtons; Isaac Newton; mass; divided; distance

Kilograms; Ken Kilo; work; divided; time

Watts; James Watts; work; divided; time

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.

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.

3.

In the image above, what hand does more work.

A

B

C

A & B are equal and are greater than C

No work is done using these three forces.

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

Explanation

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

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

Gear

Pulley

Machine

Wheel and axel

Lever

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

Explanation

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

5. 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.

Input force; output force; work done

Input force; output force; power used

Output force; input force; work done

Output force; input force; power used

Output force; input force; mechanical advantage

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

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

6. Which of the following is a calculation of work?

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

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

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

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

Both 'A' and 'D' are correct.

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.

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.

7. 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?

70N

9.8N

5m

686N

None of the above

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

Explanation

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

8. 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.

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.

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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10. Any process that is not 100% efficient is ___________

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

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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