Analyzing Energy
What is the definition of energy?
Energy is the ability to do work or cause change.
What is work in terms of energy?
Work is the transfer of energy when a force moves an object.
How does mass affect kinetic energy?
More mass means more kinetic energy if speed is the same.
What is the Law of Conservation of Energy?
Energy cannot be created or destroyed, only transformed or transferred.
Describe what happens to the energy of a bow and arrow when the string is pulled back.
The energy stored in the bow increases as potential energy when the string is pulled back.
Give an example of how energy is transferred when you push a pencil across a table.
Your hand transfers mechanical energy to the pencil, making it move.
Describe how the speed of an object influences its kinetic energy.
Kinetic energy increases with the square of the speed. Y = X^2
How does energy transfer when a rolling ball collides with a stationary ball?
Energy is transferred from the rolling ball to the stationary ball, causing it to move.
Name two forms of potential energy and give an example of each.
If an object has kinetic energy, what can it do?
It can perform work or cause changes.
What happens to the potential energy of an object as it falls?
It decreases and is converted into kinetic energy.
Describe the energy transformations that occur when a match is lit.
Chemical energy changes into thermal and light energy.
How does a roller coaster car at the top of a hill have potential energy?
It has potential energy due to its height above the ground.
Explain how potential energy can be transformed into kinetic energy using a rubber band.
Stretching a rubber band stores potential energy, which becomes kinetic energy when released.
Compare the kinetic energy of two animals, one that is running at high speed and another that is standing still.
The running animal has much more kinetic energy than the stationary one.
Explain the energy transformations and transfers that happen during an asteroid impact.
Kinetic energy changes into heat, sound, and shock waves.
Explain the difference between kinetic energy and potential energy.
Kinetic energy is the energy of motion, while potential energy is stored due to position or state.
What is the unit of measurement for energy and work?
The joule (J).
If an object has a mass of 2 kg and is moving at a velocity of 3 m/s, what is its kinetic energy?
9 joules.
What forms of energy are involved in a thunderstorm?
Thermal, electrical, and kinetic energy.