KE & PE QUIZ REVIEW

Vocab

100

What is the definition of energy?

the ability to do work or cause change

200

What is a Joule (J)?

The SI unit for energy

300

What is elastic potential energy?

energy stored by something that can stretch or compress

400

what is the definition of chemical potential energy?

energy that is stored in chemical bonds

500

what is the definition of gravitational potential energy?

anything that can fall has stored GPE

Kinetic Energy

100

What is the definition of kinetic energy?

energy in the form of motion

200

What is the equation for KE?

KE = 1/2 x m x v²

300

A runner has a mass of 75 kg and is running at 20 m/s. What is their KE?

KE = 1/2 (75) (20²)

KE = 15,000 J

400

You serve a volleyball with a mass of 2.1 kg. The ball leaves your hand at a speed of 30 m/s. What is the KE?

(Show all work on the whiteboard) 

KE = 1/2 (2.1)(30²)

KE = 945 J

500

A car is traveling with a velocity of 40 m/s and has a mass of 1120 kg. What is the cars KE? 

KE = 1/2 (1120) (40²)

KE = 896,000 J

Potential Energy

100

What is the definition of potential energy?

energy that is stored

200

What is the equation for gravitational potential energy?

PE = m x g x h 

300

A diver has a mass of 62 kg and is standing on a diving board 50 meters high. What is their PE?

PE = mgh

PE = (62)(9.8)(50)

PE = 30,380 J

400

A bell at the top of a tower is 45 m high. The bell has a mass of 22.5 kg. What is the PE of the bell?

PE = mgh

PE = (22.5)(9.8)(45)

PE = 9,922.5 J

500

A skier at the top of Wachusett mountain (611 meters) and has a mass of 74 kg. What is their potential energy at the top of the mountain?

PE = mgh

PE = (74)(9.8)(611)

PE = 443,097.2 J

Random

100

What is the gravitational force on Earth?

9.8

200

What are the two kinds of mechanical energy?

Kinetic and Potential

300

If a cat is stuck on a branch 20 meters high and has a gravitational potential energy of 180 J, calculate the mass of the cat. 

PE = mgh

m = PE / g x h

m = 180 / 9.8 x 20

m = 0.9 kg

400

Calculate the mass of an object if the KE is 87 J and the velocity is 12.5 m/s

KE = 1/2 mv²

m = 2 X KE / v²

m = 2 x 87 / 12.5² 

m = 1.1 kg 

500

Calculate the velocity of an object if the kinetic energy is 84.5 J and the mass is 50 kg. 

v = sqroot 2 x KE / m

v = sqroot 2 x 84.5 / 50

v = 1.8 m/s

Random

100

Name a form of energy

Electric, chemical, thermal, radiant 

200

What is the law of conservation of energy?

Energy cannot be created or destroyed 

300

If a student is holding a pencil that has a gravitational potential energy of 2 J and has a mass of 0.8 kg, calculate the height of the pencil. 

PE = mgh

h = PE / m x g 

h = 2 / 0.8 x 9.8

h = 0.3 m 

400

A rock climber has a gravitational potential energy of 15000 J and a mass of 73.4 kg. Calculate their height on the mountain. 

PE = mgh

h = PE / m x g 

h = 15000 / 73.4 x 9.8

h = 20.9 m

500

Calculate the velocity of an object that has a kinetic energy or 160.4 J and a mass of 18 kg. 

v = sqroot 2 x KE / m

v = sqroot 2 x 160.4 / 18

v = 4.2 m/s