Work and Simple Machines Review

What is the formula for calculating work?

• Work = Force X Distance

• Work = Force + Distance

Which is an example of work?

• trying to push a car that doesn't move out of deep snow

• pushing a child on a swing

Simple machines make work easier because they __________________.

• reduce force and/or increase distance

• decrease the amount of work being done

Which pulley or pulley system would require the least amount of force?

• A

• B

• C

• D

Tags

NGSS.MS-ETS1-2

NGSS.MS-ETS1-3

NGSS.MS-PS2-2

Which instrument measures force?

• spring scale

• barometer

• meter stick

• balance

Which unit is used to measure force?

• grams

• Newtons

• Joules

• meters

Which inclined plane would require the least amount of force to move an object?

• A

• B

• C

• D

Tags

NGSS.MS-PS2-2

Which statement is true about simple machines?

• A simple machine is a device that makes work easier.

• A simple machine is a device that reduces how much needs to be done.

How much work is done if an object is moved 10m using a force of 30N?

• 300 J

• 300 m

• 40 J

The efficiency of a machine doing work is always less than 100 percent because _______________.

• some efficiency is gained

• some efficiency is lost to friction

• the object doesn't move

• there is no force being used

Tags

NGSS.MS-PS3-3

NGSS.MS-PS3-5