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Work, Power, and Machines

Authored by Amy Buie

Physics

10th Grade

Used 12+ times

Work, Power, and Machines
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30 questions

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1.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

If you have to apply 40 N of force on a crowbar to lift a rock that weighs 400 N, what is the actual mechanical advantage of the crowbar?

0.1

10

360

16,000

2.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

How can you make the work output of a machine greater than the work input?

by decreasing friction

by increasing the input force

by increasing the output distance

none of the above

3.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

A machine is a device that can multiply

force.

power.

work.

all of the above.

4.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

A 750-W motor might also be rated as a

0.5-horsepower motor.

1-horsepower motor.

2-horsepower motor.

10-horsepower motor.

5.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

If you know the input distance and output distance of a machine, which of the following can you calculate?

work

actual mechanical advantage

efficiency

ideal mechanical advantage

6.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

When a machine does work, if cannot do which of the following?

change the direction of a force.

increase a force and change the distance a force moves.

increase the distance a force moves and change the direction of a force.

increase a force and increase the distance a force moves an object.

7.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

The actual mechanical advantage of a machine

cannot be less than 1.

decrease as the input distance increases.

increases with greater friction.

is less than the ideal mechanical advantage of the machine.

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