Physics & Chemistry, Ch.3, Physical i Science

Which of the following is the correct definition for work?

• Work is the transfer of energy that occurs when a force is applied over a distance.

• Work is not the transfer of energy that occurs when a force is applied over a distance.

• Work is the transfer of levers that occurs when a force is applied over a distance.

• Work is the transfer of energy that occurs when a newton is applied over a distance.

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NGSS.MS-PS3-4

NGSS.MS-PS3-5

(a)   is the rate at which work is done.

What is the SI unit of work and energy

• newton

• meters

• joule

• kilometers

The (a)   of a machine is the ratio of the output work to the input work.

Which of the following is the correct equation for mechanical advantage?

• MA = F in / F out

• MA = F out / F in

• MA = d/t

• MA = lwh

Which of the following is the correct equation for efficiency?

• efficiency = (W in / W out) 100%

• efficiency = (W out / W in) 101%

• efficiency = (W out / W in) 50%

• efficiency = (W out / W in) 100%

Two or more simple machines that operate together form a (a)   machine.

How many classes of levers are there?

• 4

• 8

• 6

• 3

A (a)   is a simple machine that is a grooved wheel with a rope or a cable wrapped around it.

A sloped surface that moves is called a _____.

• pulley

• wedge

• compound machine

• wheel and axle