Energy Forms and Kinetic Energy
Complete this assignment on a separate sheet of paper and show your work!
1. Describe energy.
- ability to cause change
- can be stored
- can move from place to place
2. List 5 different forms of energy and give an example of each.
-- electrical energy (TV, radio, lights)
-- chemical (food, gasoline, wood, batteries)
-- radiant (from the sun, electromagnetic waves)
-- thermal (friction, stove)
-- mechanical (sum of potential and kinetic energy)
3. What is the unit for energy?
Joule
4. What is 1 Joule equal to?
1Nxm
5. Describe Kinetic Energy.
Energy of motion
6. What is the equation to calculate kinetic energy?
KE = mv2
2
7. Roger Maris swung a bat which had a mass of 2 kg at a velocity of 45 m/s. How many Joules of kinetic
energy could he give to the ball?
KE = mv2
2
KE = ? J
m = 2 kg
v = 45 m/s
KE = 2 kg x (45 m/s)2
2
KE = 2,025 J
8. Barry Bonds swings a bat that has a mass of 1.5 kg at a velocity of 55 m/s. How many Joules of kinetic
energy could he give to the ball?
KE = mv2
2
KE = ? J
m = 1.5 kg
v = 55 m/s
KE = 1.5 kg x (55 m/s)2
2
KE = 2,268.75 J
9. A golf pro has 2100 J of kinetic energy and swings his driver which weighs 0.75 kg. What is the speed of his
swing?
KE = mv2
2
KE = 2100 J
m = 0.75 kg
v = ? m/s
2100 J = 0.75 kg x v2
2
4200 = 0.75 x v2
5,600 = v2
v = 74.8 m/s
10. A soccer ball has 1200 J of kinetic energy and a mass of 0.8 kg. What is the speed of the ball when it is
kicked?
KE = mv2
2
KE = 1200 J
m = 0.8 kg
v = ? m/s
1200 J = 0.8 kg x v2
2
2400 = 0.8 x v2
3,000 = v2
v = 54.8 m/s
11. A running back has 3500 J of kinetic energy and is running at a speed of 8 m/s. Calculate his mass.
KE = mv2
2
KE = 3500 J
m = ? kg
v = 8 m/s
3500 J = m x (8 m/s)2
2
7,000 = m x 64
m = 109.4 kg