Power Review

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

• True
• False

Work is done when a weightlifter lifts a barbell above their head.

• True
• False

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

If there is MORE POWER used to move an object, there has to be MORE WORK being done.

• True
• False

Tags

NGSS.HS-PS3-3

If 68 W of power is produced in 18 seconds, how much work is done?

• 1,224 J
• 0.264 J
• 3.77 J
• 12.24 J

Tags

NGSS.HS-PS3-1

How much power is used if 720 J of work is done in 8 seconds?

• 5760 Watts

• 90 Watts

• 64800 Watts

• 720 Watts

The unit used to measure power is the 

• Watt
• Newton
• Joule
• Newton*meter