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

Tags

NGSS.MS-PS3-5

NGSS.MS-PS3-4

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

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

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

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.MS-PS3-4

An object of mass 6.8 kg is lifted to a height of 1.3 m. How much work is done on the object?

• 86 J

• 8.1 J

• 5.23 J

• No work is done.

If the direction of an applied force is anti-parallel (opposite) to the direction an object is moving:

• Negative work is done.

• Positive work is done.

• No work is done.

Tags

NGSS.MS-PS3-5

If the direction an object is displaced is the same as the direction of a force applied to it:

• Positive work is done.

• Negative work is done.

• No work is done.

Tags

NGSS.MS-PS3-5