Work and Power

What is work?

• A push or pull.
• The distance an object can be moved.
• Applying a force & moving an object.
• The rate at which energy is transferred.

The door to the classroom weighs 3 kg. How much work is done when Michael pushes on the door to the classroom with 15 Newtons of force, pushing the door 1.3 meters?

• 45 Joules
• 19.5 Joules
• 3.9 Joules
• 58.5 Joules

Tags

NGSS.HS-PS3-2

Ms. McDonald holds a desk perfectly still above her head. If she holds the desk at a height of 0.5 meters above her head, and applis 68 Newtons of force to do so, how much work has she done?

• 34 Joules
• 0 Joules

I do 12 Joules of work on a bookcase. If I apply a force of 6 Newtons, how far have I moved the bookcase?

• 2 meters
• 792 meters
• 17 meters
• 320 meters

If you move an object a greater distance... 

• you have more power
• you do more work
• you do the work faster
• you do less work

If you push an 5 N object 2 m and then push a 10 N object 2 m. which is TRUE?

• you do the same amount of work
• you are more powerful when you move the 5 N object
• you do more work when you move the 10 N object
• you use the same amount of force

What is the definition of power?

• the amount of work an object does
• the rate at which force is applied
• the amount of matter in an object
• the rate at which work is done

Johann Sebastian Bach carries his piano up the stairs doing 2500 Joules of work. If he did this in 25 seconds, how much power did he do?

• 62,500 Watts
• 6200 Wats
• 100 Watts
• 125 Watts

Gravity is pulling down on Mr. Mitchell with 850 Newtons of force. If he climbs 30 meters up the cliff in 30 seconds, how much power did he show?

• 850 Watts
• 28.3 Watts
• 765,000 Watts
• 1.06 Watts

Tags

NGSS.HS-PS3-1

Kyrell pushes a basketball with a force of 32 Newtons. In 4 seconds, he moves the ball 12 meters. How much power did Kyrell demonstrate?

• 32 Watts
• 96 Watts
• 10.67 Watts
• 1536 Watts