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# Ch 13

### 2 Semester Science Exam

Define Energy. Ability to do work or cause change.
What is the SI unit for energy? Joules (J)
Kinetic Energy (KE) depends on what two things? Mass and velocity
Which has a greater effect on KE: Mass or velocity? Why? Vecocity, because velocity is squared. Doubling velocity will quadruple its kinetic energy.
Potential energy (PE) depends on what two things? An object's position and shape.
Gravitational potential energy (GPE) is energy due to __________ and ________. Weight and height.
GPE depends on what two things? Weight and height.
What is elastic potential energy? Give an example. Potential energy associated with objects that can be stretched or compressed. Ex. bow string.
What does it mean for energy to be transformed? Give an example. When energy changes from one form to another, like burning gas in a car transforms chemical energy to mechanical energy.
What is the law of conservation of energy? No energy is destroyed or lost when energy changes to another form.
What does Einstein have to do with the law of conservation of energy? Einstein discovered that matter can be transformed to energy. Therefore in some situations, energy alone is not conserved.
Created by: summerboyi
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