Work, Energy, and Simple Machines

How much work is done in holding a 15 N sack of potatoes while waiting in line at the grocery store for 3 minutes?

• 15 J
• 45 J
• 0 J
• 5 J

If 800 N of force is applied to move an object 20 meters, how will be how much work done?

• 40 J

• 2,000 J

• 400 J

• 20,000 J

Which situation is work not done?

• lifting a 20 pound box off the floor
• holding a 20 pound box above the floor
• sliding a 20 pound box across the floor
• sliding a 20 pound box up an inclined plane

50 N of force is applied to drag a bag of books across the floor. If the bag is dragged 5 m at a 21° angle, how much work is done?

• 5000 J

• 200 J

• 90 J

• 300 J

An axe is an example of a

• pulley
• inclined plane
• screw
• wedge 

A seesaw is an example of a  

• wedge
• lever 
• inclined plane 
• pulley 

Stairs

• wedge
• pulley
• inclined plane
• wheel and axle

Tags

NGSS.MS-ETS1-1

Lightbulb

• wedge
• pulley
• incline plane
• screw

Which is not a type of simple machine?

• spring
• screw
• pulley
• wedge

What type of simple machine is found on the cap of a pickle jar?

• lever
• inclined plane
• pulley
• screw