Understanding Energy Conservation

What is the formula for kinetic energy (KE) of an object?

Which of the following factors does the potential energy (PE) of an object depend on?

• Mass and velocity

• Mass, acceleration due to gravity, and height

• Velocity and height

• Mass and velocity squared

In a closed system, what is true about the total energy?

• It increases over time

• It decreases over time

• It remains constant

• It depends on external forces

Which of the following is an example of a mechanical system where kinetic and potential energy are exchanged?

• A roller coaster

• A stationary rock

• A light bulb

• A battery

What happens to the potential energy (PE) of an object if its height above the reference surface is cut in half?

• It remains the same

• It doubles

• It is divided by two

• It quadruples

What is the formula for total energy of a mechanical system composed of kinetic and potential energy?

Which of the following best describes the relationship between kinetic energy and potential energy in a roller coaster?

• Kinetic energy is always greater than potential energy

• Potential energy is always greater than kinetic energy

• Kinetic energy and potential energy are constantly exchanged

• Kinetic energy and potential energy are unrelated

Which point has greatest kinetic energy?

• A
• B
• C
• none

How much kinetic energy does a moving object have if its mass is 100 kg and it is moving at a speed of 5 meters per second?

• 2,500 J
• 250 J
• 1,250 J
• 125,000 J

Which skier will have a greater potential energy? 

• Skier 1
• Skier 2