Simple Machines, Power and Work

The unit used to measure work is the 

• Watt
• Newton
• Joule
• meter

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

• wedge 
• lever 
• pulley 
• screw

Any device that makes work easier is called a ______________________.

• Joule 
• prop
• lever
• machine

A force exerted over a distance to move an object is ______________________.

• power
• work
• momentum
• Watt

A simple machine with a straight slanted 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
• carrying a box

A rigid bar free to move about a fixed point is a ______________________.

• screw 
• lever
• wedge 
• pulley

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

• magic
• friction
• smoke
• input

Tags

NGSS.MS-PS2-2

A _____________________ is an inclined plane that moves.

• screw
• pulley
• wedge
• wheel

A ramp is an example of a(n) ____________________.

• wheel and axle
• inclined plane
• lever
• pulley