Question

1. which sequence correctly shows an increase in kinetic energy?

a. e,f,b,g
b. d,e,b,f
c. b,f,e,c
d. a,g,f,c

1. which sequence correctly shows a decrease in kinetic energy?

a. e,f,b,g
b. d,e,b,f
c. b,f,e,c
d. a,g,f,c

1. which sequence correctly shows a decrease in potential energy?

a. e,f,b,g
b. d,e,b,f
c. b,f,e,c
d. a,g,f,c
part 2: determine whether the following objects have kinetic, potential, or mechanical energy. think about the definition of mechanical energy before answering the questions!

1. you serve a volleyball and it leaves your hand with a speed of 30 m/s. the volleyball has

______________________________________ energy.

1. a baby carriage is sitting at the top of a hill that is 21 meters high. the baby carriage has

______________________________________ energy.

1. a car is traveling with a velocity of 40 m/s. the car has

______________________________________ energy.

1. a diver is standing on the edge of a diving board that is 40 meters high. the diver has

______________________________________ energy.

1. a roller coaster is at the top of a 72 - meter hill. the roller coaster has

______________________________________ energy.

1. a roller coaster is traveling down a 50 - meter drop and is about half - way down the hill. the roller coaster has a speed of 35 m/s. the roller coaster has

______________________________________ energy.

1. a roller coaster is at the bottom of a 50 - meter drop. the roller coaster has

______________________________________ energy.
adapted from: http://www.slideshare.net/angel4all/kinetic - vs - potential - energy - worksheet

Explanation:

Step1: Recall energy definitions

Kinetic energy is energy of motion ($KE=\frac{1}{2}mv^{2}$), potential energy is stored energy often due to height ($PE = mgh$), and mechanical energy is the sum of kinetic and potential energy.

Step2: Analyze each situation

1. Volleyball leaves hand with speed. It has kinetic energy as it is in motion.
2. Baby - carriage at top of hill has potential energy due to its height.
3. Car traveling has kinetic energy because of its velocity.
4. Diver on diving - board has potential energy due to height.
5. Roller - coaster at top of hill has potential energy due to height.
6. Roller - coaster moving and at some height has both kinetic (due to speed) and potential (due to height) energy, so mechanical energy.
7. Roller - coaster at bottom of drop has kinetic energy (assuming no friction, all potential energy is converted to kinetic).

Answer:

1. Kinetic
2. Potential
3. Kinetic
4. Potential
5. Potential
6. Mechanical
7. Kinetic