Work Power Simple Machines

• wedge
• pulley
• inclined plane
• wheel and axle

Tags

NGSS.MS-PS2-1

Which of these is an example of a wedge?

• skateboard
• broom
• stairs
• scissors

• Wheel and axle, Pulley, Lever

• Wheel and axle, Pulley

• Lever, Pulley

• Wheel and axle, Pulley, Lever, Wedge

Tags

NGSS.MS-PS2-1

Which is an example of someone using a simple machine to do work?

• A boy runs across a football field.
• A banker counts money.
• A man pushes a stroller up a ramp.
• A girl eats a sandwich.

What is the unit used to measure power?

• Joule
• Watt
• Newton
• %

What is the unit used to measure work?

• Joule
• Watt
• Newton
• %

What is the unit used to measure efficiency?

• Joule
• Watt
• Newton
• %

What is the unit used to measure mechanical advantage?

• Joule
• Watt
• Newton
• (no unit needed)

Power is:

• how fast work is done.
• a force applied through a distance.
• being in control.
• how strong you are.

Tags

NGSS.MS-PS3-5

You do work when

• you exert a force on an object but the object does NOT move.  
• you exert a force on an object that causes it to move in the same direction as the force.
• you exert a force on an object and it moves in the opposite direction of your force.  
• the object moves, but no force is applied.