Energy, Work, and Power

Potential Energy

100

Define Potential Energy

Stored Energy

Energy caused by position

Ability to do Work

200

Equation for Potential Energy

PE = mgh

300

A ball of mass 10 kg is stuck in a tree branch that is 15 m tall. Find the PE of the ball

1470 J

400

A cat of mass 5 kg is stuck in a tree. The cat's PE is 5243 J. Find the height of the tree

107 m

500

A ball dropped from a building hits the ground with a velocity of 20 m/s. Find the height the ball was dropped from

20.4 m

Kinetic Energy

100

Define Kinetic Energy

Energy of motion

200

Equation for KE

KE = (1/2)mv²

300

A truck of mass 8,000 kg is driving at a velocity of 36 m/s. Find the KE of the truck

5,184,000 J or 5184 kJ

400

A car with a mass of 5000 kg has a KE of 6,250 kJ. Find the car's velocity

50 m/s

500

A squirrel knocks an acorn that was hanging 20 m high off a branch and it falls to the ground. Find the acorn's velocity as it hits the ground

19.8 m/s

Mechanical Energy

100

Define Mechanical Energy

Total Energy of a System

200

Equation for ME

ME = PE + KE

300

A cart on a roller coaster has a PE of 140 J and a KE of 60 J. Find the carts ME

200 J

400

A plane flying at a constant speed of 250 m/s has a mass of 80,000 kg, at an altitude of 975 km, and has a ME of 7.669 x 10¹¹ J. Find the planes PE

7.644 x 10¹¹ m

500

A capuchin monkey in a tree has a mechanical energy of 2000 J, a mass of 3 kg, and is traveling through the tree at an elevation of 60 m. Find the monkey's velocity

12.5 m/s