QUESTION: 85

If you drag a log across the road, one way to reduce the amount of force needed to pull it would be to
__________.

use a thicker rope
pull harder
cross at an angle
lubricate the road

Answer(s): D

Explanation:

If you drag a log across the road, one way to reduce the amount of force needed to pull it would be to lubricate the road.
Two things contribute to the force needed to pull the log across the road: the weight (mass) of the log itself, and the friction between the log and the road.
Lubricating the road will reduce the friction and therefore reduce the force needed to pull the log across the road.

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QUESTION: 86

Presume that Pulley C is rotating clockwise. What direction will Pulley A rotate?

Clockwise
Counterclockwise
Insufficient information to answer
Pulley A will not rotate

Answer(s): A

Explanation:

By rotating clockwise. Pulley C will cause Pulley B to rotate counterclockwise, which will in turn cause Pulley A to rotate clockwise.

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QUESTION: 87

The rate at which work is done is called __________.

Power
Effort
Watts
Horsepower

Answer(s): A

Explanation:

The English unit of power is foot pound per second. It takes 550 foot pounds to make 1 horsepower. The SI unit is the joule per second or watt. A horsepower is 746 watts. The rate at which work is done is called power. Power is work done per unit of time.

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QUESTION: 88

Forces existing in pairs are sometimes called ___________.

action and interaction
reaction and interaction
action and reaction
friction and gravity

Answer(s): C

Explanation:

A force cannot be exerted unless there is something there to push back. Forces exist in pairs. For every action there is a reaction.

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Free ASVAB Section 3: Mechanical Comprehension Exam Braindumps (page: 22)

QUESTION: 85

Explanation:

QUESTION: 86

Explanation:

QUESTION: 87

Explanation:

QUESTION: 88

Explanation: