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

What is the equation for calculating work? 

• force times distance 
• force divided by distance 
• force plus distance 
• mass times acceleration 

What are the units for work? 

• newtons
• meters
• force 
• joules 

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

• wedge
• screw
• lever
• inclined plane 

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

• lever
• pulley
• wheel and axle
• fulcrum 

The "fixed point" on which a lever rests and, or pivots is known as which of the following?

• screw
• wheel and axle
• see saw 
• fulcrum 

A seesaw is an example of which machine?

• wedge
• lever 
• inclined plane 
• pulley 

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

• wedge 
• lever 
• pulley 
• screw

A 50 N block is lifted 10 m. How much work was done?

• 50000 J
• 5000 J
• 500 J
• 50 J

The device used to raise a flag up a flag pole is an example of a

• wheel and axle

• lever

• inclined plane

• pulley