Work and Power

How much work is being done with 200 N of force over 426 meters?

• 85,200 J
• 45,620 J
• 90,480 J
• 62,329 J

If 150 Joules of work is needed to move a box 10 meters, what force was used? 

• 1500 N
• 15 N
• 1.5 N
• 150 N

Work is done when a weightlifter holds a barbell still above his head.

• True
• False

You push against the back of your friends car that is stuck. You push and be become very tired, but the car does not move. Did you do work?

• Yes, work was done

• No, work wasn't done

The amount of work done in a certain amount of time is known as 

• work
• effort force
• resistance force 
• power

If you increase your work and decrease your time, you will have

• more power

• less power

• same amount of power

• power rating can not be determined

If you have the same work as someone, but in less time

• You are more powerful

• You are less powerful

• You have the same power

Person A and Person B are both using the same amount of work to lift something. Person A takes half as much time to do it. Who has greater power.

• Person A

• Person B

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

The more POWER you use to move an object, the more work you do. 

• True
• False