# Chapter 7 Practice Quiz Al - Period 7 - Friday, 4/17/20

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Archbishop Wood High SchoolPhysics 9 AL – Period 7Date: 4/17/20 Read moreChapter 7 Practice Quiz – Machines, Work, and EnergyMs. Antes DIRECTIONS: Identify the choice that best completes the statement or answers the question.

• 1.

### In a theoretical machine, work output:

• A.

Can be calculated by dividing output displacement by output force.

• B.

Is always greater than the work input.

• C.

Can be calculated by multiplying output force by output displacement.

• D.

Is always less than the work input.

C. Can be calculated by multiplying output force by output displacement.
Explanation
Section 7.2

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• 2.

### The metric unit for work is the:

• A.

Newton.

• B.

Joule.

• C.

Watt.

• D.

Meter.

B. Joule.
Explanation
Section 7.1

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• 3.

### The fixed point around which levers rotate is called the:

• A.

Input Arm.

• B.

Output Arm.

• C.

Fulcrum.

• D.

Lever Arm.

C. Fulcrum.
Explanation
Section 7.2

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• 4.

### Friction is a “catch-all” term for many processes that oppose:

• A.

Heat.

• B.

Wear.

• C.

Motion.

• D.

None of the above.

C. Motion.
Explanation
Section 7.3

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• 5.

### All of the following are considered to be simple machines EXCEPT:

• A.

Scissors.

• B.

A bicycle.

• C.

A jackknife.

• D.

A see-saw.

B. A bicycle.
Explanation
Section 7.2

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