Machines

What is a simple machine?

• a device that has only one working motor
• a device that makes work easier
• a device that makes more work for a job
• device that is made up of two or more machines

A flat sloping surface that connects lower and higher elevations. It makes raising objects easier.  

• wedge
• screw
• lever
• inclined plane 

An inclined plane wrapped around a rod forms this simple machine 

• lever
• pulley
• screw
• wedge 

A simple machine that consists a rigid bar that pivot about a fixed point

• lever
• pulley
• wheel and axle
• fulcrum 

A seesaw is an example of which machine?

• wedge
• lever 
• inclined plane 
• pulley 

A door knob is an example of which machine?

• wheel and axle
• swrew
• pulley 
• inclined plane 

Stairs are a 

• wedge
• pulley
• inclined plane
• wheel and axle

Tags

NGSS.MS-PS2-2

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

• wedge 
• lever 
• pulley 
• screw

All simple machines help make work _________.

• harder
• smaller
• lighter
• easier

Simple machines can change the amount of_______ needed to do work.

• gravity
• people
• force
• pulley