Work Power and Energy

A construction worker pushes a wheelbarrow 10 m with a horizontal force of 5 N. How much work is done by the worker on the wheelbarrow?

• 5 J

• 15 J

• 2 J

• 50 J

Tags

NGSS.MS-PS3-5

How do we calculate work?

• W = F * d

• w = f * D

• W = F * D

• w = f * d

Why does the total amount of mechanical energy stay constant in a system?

• energy is not created or destroyed

• energy leaves

• energy enters

• energy is not converted from one form into another

Bob (80 kg) uses 180 N of force to get him up the slope. The vertical distance is 2 m and the diagonal is 10 m. Calculate the work he does.

• 1600 J

• 160 J

• 3600 J

• 1800 J

Tags

NGSS.HS-PS2-1

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

Tags

NGSS.MS-PS3-4

NGSS.MS-PS3-5

At which point(s) on the roller coaster is the kinetic energy at its maximum?

• A

• B

• C

• D

Tags

NGSS.MS-PS3-1

NGSS.MS-PS3-4

NGSS.MS-PS3-5

At which point(s) on the roller coaster is the gravitational potential energy at its maximum?

• A

• B

• C

• D

Tags

NGSS.MS-PS3-2

Groot rescues Rocket from the bottom of a deep pit. Groot expends 1000 J of energy lifting Rocket who has a mass of 50 kg out of the pit. How deep is the pit?

• 0.5 m

• 2 m

• 4 m

• 10 m

Tags

NGSS.MS-PS2-4

NGSS.MS-PS3-4

How do you calculate power?

• P = W/t

• P = E/t

• P = w * t

• P = bbq/chicken

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