Work Energy Relationship

A student needs 10 Newtons of force to lift a box to the top of a 2 meter shelf. How much work do they do?

• 12 J

• 8 J

• 20 J

• 5 J

Tags

NGSS.MS-PS3-5

Definition of work energy theorem is, the work done by the nett force on a body equals to the _________________________________

• change in the body’s elestic energy

• change in the body’s kinetic energy

• change in the body’s gravitational energy

• change in the body’s potential energy

Tags

NGSS.HS-PS3-1

NGSS.HS-PS3-2

A weight-lifter raises a 2000N weight through a vertical height of 2.0m in 0.80s. What useful power does he develop in doing this?

• 800 W

• 700W

• 4000W

• 5000W

What is needed calculate power?

• work

• time

• mass

• distance

A 10.0 kg box is accelerated from 2.0 m/s to 4.0 m/s. What is the amount of work needed to accelerate the box?

• 50 J

• 60 J

• 20 J

• 45 J

Tags

NGSS.HS-PS2-1

NGSS.HS-PS3-1

True or false: the net work done on a body is equal to its change in kinetic energy.

• True
• False

What does work equal when the final change in kinetic energy equals 20,000 J?

• 0J

• 2041J

• 20,000J

• 4164931J

Tags

NGSS.HS-PS2-1

A 12 kg book is pushed from rest to a final velocity of 10 m/s. The book travels 6 m. How much force was the book pushed with?

• 600 N

• 100 N

• 200 N

• 1200 N

Tags

NGSS.HS-PS2-1

What is the unit of measurement for power?

• Joules
• Watts
• Voltage
• Calories

A kettle transfers 1000J of energy every 2 seconds. Calculate its power.

• 2000 Watts
• 1000 Watts
• 500 Watts
• cannot be determined