Work: Question Preview (ID: 8385)

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Work is described as
a) a push or a pull.
b) a force that cause an object to move in the same direction as the force.
c) two forces acting upon an object in opposite directions.
d) mass times acceleration.

Units used to express work in an equation are
a) newtons
b) watts
c) joules
d) ohms

A man pushes a crate with a force of 30 N. He pushes it for 40 meters. How much work does he do?
a) 10 joules
b) 70 joules
c) 300 joules
d) 1,200 joules

How are work and power related?
a) Work is the continuance of motion in one direction.
b) Power is how fast work happens.
c) Work and power are both forces.
d) Both are measured in joules.

To calculate power, you
a) multiply the amount of work completed by the time it takes to do the task.
b) divide the amount of work completed by the time it takes to do the task.
c) add the joules to the time it takes to complete the task.
d) subtract the joules from the time it takes to complete the task.

Machines
a) make work easier.
b) enable you to do less work.
c) only change the direction of hte forces involved in work.
d) only change the size of the forces involved in the work.

Which of the following is NOT a simple machine?
a) lever
b) pulley
c) wheel and axle
d) car engine

You lift up a 50 N chair to a height of 0.5 m and carry it 10 m across the room. How much work did you do?
a) 25 j
b) 35 j
c) 60 j
d) 500 j

Power is expressed in joules/second, also known as the
a) joule
b) ampere
c) watt
d) newton

In which of the following situations would you do the most work?
a) Lifting two 45 N bowling balls 1 meters off the floor
b) Lifting one 30 N bowling ball 2 meters off the floor
c) LIfting three 20 N weights 3 meters off the floor
d) Lifting one 50 N barbell 2 meters off the floor

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