Name: ______________________________
Section: _____
7. A rubber ball speeds up as it falls toward the floor. How do the motion energy (kinetic energy) and
gravitational potential energy of the ball change as it falls and why?
A. Both the motion energy and gravitational potential energy increase because new energy is always made as
an object moves.
B. Both the motion energy and gravitational potential energy decrease because energy is always used up as an
object moves and is not transformed into any other form of energy.
C. The motion energy decreases and the gravitational potential energy increases because the motion energy is
transformed into gravitational potential energy.
D. The motion energy increases and the gravitational potential energy decreases because the gravitational
potential energy is transformed into motion energy.
9. A student has two identical glasses of milk except that the temperature of the milk in one glass is 40ºF
and the temperature of the milk in the other glass is 80ºF.
The milk at which temperature has more thermal energy?
A.
B.
C.
D.
The milk at 40ºF has more thermal energy.
The milk at 80ºF has more thermal energy.
Both the milk at 40ºF and the milk at 80ºF have the same amount of thermal energy.
Neither the milk at 40ºF nor the milk at 80ºF has any thermal energy.
Name: ______________________________
Section: _____
8. Which of the following describes how energy is transferred between the sun and a tree?
A.
B.
C.
D.
Energy is transferred as light is radiated from the sun and directly absorbed by the tree.
Energy is transferred as an electrical current travels from the sun to the tree.
Energy is transferred as thermal energy is given off from the sun and directly absorbed by the tree.
Energy is not transferred between the sun and the tree.
10. A person hangs three pictures on the wall. The pictures all weigh the same. Picture 1 and Picture 2 are at
the same height above the floor. Picture 3 is directly below Picture 1.
Which pictures have the same amount of gravitational potential energy?
A.
B.
C.
D.
Pictures 1 and 2 have the same amount of gravitational potential energy.
Pictures 1 and 3 have the same amount of gravitational potential energy.
Pictures 2 and 3 have the same amount of gravitational potential energy.
All of the pictures have the same amount of gravitational potential energy.
Name: ______________________________
Section: _____
Forms of Energy Quiz
Use these equations to solve the following potential and kinetic energy problems:
PE = M x G x H
KE = ½ M x V2
*You may use 10 m/s2 for the force of gravity
1. A baby carriage is sitting at the top of a hill that is 21 m high. The carriage with the baby weighs 12 kg.
What is its potential energy?
2. A car is travelling at a velocity of 40 m/s and has a mass of 1100 kg. What is its kinetic energy?
3. There is a bell at the top of a tower that is 45 meters high. The bell has a mass of 190 kg. What is its
potential energy?
4. A wagon gets away from you while you are playing and is rolling down a hill towards your father’s car at
a speed of 5 m/s. The mass of the wagon is 6 kg. If it hits the car with more than 70 joules of energy, it will
dent the car. Should you be worried? (In other words, will the wagon dent the car?) Show your work.
5. The potential energy of an apple hanging in a tree is 10 joules. The branch it is hanging from is 4 meters
off the ground. What is the mass of the apple?
Name: ______________________________
Section: _____
Short Answer Questions:
1. A little girl has a wind-up monkey like the one shown on the right. Make an energy transformation chain
that shows how energy changes form as the girl uses her muscles to wind the monkey and then lets it go and
it begins to walk and clash its cymbals together. Include at least 4 forms of energy.
2. A student has two identical glasses of milk except that the temperature of the milk in one glass is 40ºF
and the temperature of the milk in the other glass is 80ºF.
The milk at which temperature has more thermal energy?
Why (how do you know)?
3. A rubber ball speeds up as it falls toward the floor. How do the kinetic energy and gravitational potential
energy of the ball change as it falls and why?
4. A 1 kg rock is falling from a cliff. Complete the table to show the potential energy at each height below.
Mass in Kg
1
1
1
1
1
1
Gravity in m/s2
10
10
10
10
10
10
Height in Meters
10
8
6
4
2
0
Potential Energy in Joules
5. Make a line graph showing the change in potential energy as the rock falls. Put the height in meters on the
y axis and the potential energy in joules on the x axis. Be sure to label your axes!