Work, Power and Machines

The unit used to measure work is the 

• Watt
• Newton
• Joule
• Meter

Tags

NGSS.MS-PS3-4

NGSS.MS-PS3-5

A ______________ is a rope or chain wrapped around a wheel. 

• wedge 
• lever 
• pulley 
• screw

Any device that makes work easier is called a ______________________.

• Joule 
• prop
• lever
• machine

The efficiency of a machine can be increased by reducing __________________________. 

• effort
• force
• fulcrum
• friction

The unit used to measure power is the 

• Watt
• Newton
• Joule
• Newton*meter

A simple machine with a flat, sloped surface is a(n) __________________. 

• lever
• wheel and axle
• inclined plane
• pulley

Which of the following is the best example of work being done. 

• doing homework
• lifting a box
• pushing a stationary box
• holding a box

No machine in existence has 100% efficiency due to ____________________.

• magic
• friction
• smoke
• input

Tags

NGSS.MS-PS2-2

Which simple machines are found on a hammer?

• lever only
• wedge and plane
• axle and lever
• screw and pulley

 Work done = Force x _________

• a. distance
• b. acceleration
• c. velocity
• d. speed