Vocabulary
What is the definition of energy?
The ability to do work or cause change; measured in Joules (J)
What is energy transfer?
The movement of energy from one place or object to another
What is potential energy?
Energy that is stored and waiting to be used
How do you calculate G.P.E.?
GPE= Mass x Height (also x gravity)
At the highest point
What is the Law of Conservation of Energy?
Energy cannot be created or destroyed, only transformed or transferred.
Provide an example of energy conversion
Possible Example: Chemical energy in food is converted to mechanical energy when you move
What type of energy is kinetic energy?
The energy an object has due to its motion
What is the formula for kinetic energy?
KE= mass x velocity (squared)/2
When is kinetic energy at its maximum?
When the object is moving fastest
What is work?
Force exerted on an object that causes it to move; a transfer of energy
What happens to the kinetic energy when a roller coaster comes to a stop?(Hint: think of our skate park)
Energy is converted to heat and sound due to friction
Give an example of gravitational potential energy
Ex. A book held above the ground; a rock sitting on a hill; a roller coaster at the top of its track
What is the formula for mechanical energy?
ME= PE + KE
How does increasing height affect potential energy?
Increasing height increases potential energy
What is mechanical energy?
The total energy associated with the motion and position of everyday objects
What type of energy transformation occurs when a car's engine burns gasoline? (Type of energy)
Chemical Energy converts to Mechanical Energy
What type of energy is stored in the bonds of atoms?
Chemical Energy
What variable has the greatest influence on kinetic energy?
Velocity
What happens to energy when friction is increased?
It decreases potential energy and kinetic energy, dissipating into heat energy
Define energy conversion
A change from one form of energy to another, also referred to as energy transformation
Explain the key idea of energy tranformation?
Energy can only be transformed from one form to another or transferred from one object to another.
Define thermal energy
A form of energy transferred by a difference in temperature
If a system's total mechanical energy is 500 J, and its kinetic energy is 280 J, what is its potential energy?
220 J
What term describes energy that appears to have been destroyed?
Dissipated energy, which converts to a different form, usually sound, heat, or light energy.