Types of Energy
A stretched rubber band has stored energy. What type of energy is this?
Elastic potential energy
A 6 kg object is lifted 8 m. How much gravitational potential energy does it gain?
480 J
A 2 kg ball is dropped from 10 m. Just before hitting the ground, how much kinetic energy does it have?
200 J
What is Mrs. Roberts's favorite season?
Spring
A ball sitting on a 5 m shelf has what type of energy?
Gravitational potential energy
What is the kinetic energy of a 4 kg object moving at 3 m/s?
18 J
A 5 kg object starts with 500 J of potential energy. At the bottom it has 350 J of kinetic energy. How much energy was converted to thermal energy?
150 J
In what month is Mrs. Roberts's birthday?
January
A roller coaster moving at the bottom of a hill has mostly what type of energy?
Kinetic energy
A 2 kg object has 400 J of gravitational potential energy. How high is it?
20 m
If mass doubles and velocity stays the same, what happens to kinetic energy?
It doubles
What is Mrs. Roberts's favorite TV show?
Survivor
A ball starts at the top of a ramp with 100 J of gravitational potential energy. When it reaches the bottom of the ramp, it has 80 J of kinetic energy. Explain why the two energies are not equal.
The missing 20 J was lost to thermal energy
An object moving at 8 m/s has 160 J of kinetic energy. What is its mass?
5 kg
A 2 kg object moving at 10 m/s has the same kinetic energy as an object with unknown mass moving at 5 m/s. What is the value of the unknown mass?
8 kg
What sport did Mrs. Roberts play in high school?
Field hockey
As an object falls freely (ignore air resistance), what happens to its gravitational potential energy and kinetic energy?
Potential energy decreases while kinetic energy increases
A 5 kg object has 250 J of kinetic energy. What is its velocity?
10 m/s
A 6 kg object has the same kinetic energy as a 3 kg object moving at 8 m/s. What is the velocity of the 6 kg object?
In what year did Mrs. Roberts graduate from high school?
2012