Physical Science- Machines, Work and Power

The ability to do work or cause change is called

• transfer

• energy

• velocity

• pressure

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NGSS.MS-PS3-1

NGSS.MS-PS3-2

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What is one way in which simple machines make work easier?

• improving the quality of axles used in cars

• creating the need for more workers

• eliminating the need for workers to apply any force when completing task

• decreasing the amount of force necessary to complete a task

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NGSS.MS-PS2-2

A boy gets his 4-wheeler stuck in the mud. He pushes on the 4-wheeler. The 4-wheeler does not move. The boy has done work.

• True

• False

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NGSS.MS-PS2-2

A seesaw is an example of what type of machine?

• inclined plane

• lever

• wheel and axle

• ball and chain

Which of the following are examples of a pulley? You may choose more than one answer

• Window Blinds

• Flag Pole

• Block and Tackle

• Ramp

How many types of simple machines are there?

• 2

• 4

• 6

• 8

Which is NOT an example of work?

• lifting a box

• putting the dishes away

• moving a pencil across the desk

• laying on the couch

A force acting on an object does no work if

• the force is greater than the force of friction

• a machine is used to move the object

• the force is not in the same direction as the object's motion

• the object accelerates

As time to do a certain amount of work decreases, the amount power used

• increases

• decreases

• is unaffected

• stays the same