energy Flashcards
What are the units of energy?
(Units and Symbol)
Joules (J)
What is an energy store?
How energy is kept by an object, ready to be used.
State the 8 energy stores
Gravitational Potential Energy
Kinetic Energy
Elastic Potential Energy
Thermal (Internal)
Chemical
Magnetic
Electrostatic
Nuclear
Describe how the gravitational potential energy store of an object can increase.
Raise it higher above the ground (higher in gravitational field), or increase the mass of the object.
Describe how the gravitational potential energy store of an object can decrease.
Lower it (closer to centre of gravitational field), or decrease the mass of the object.
Describe how the elastic potential energy store of an object can increase.
By stretching, compressing or bending (deforming) an elastic object.
Describe how the kinetic energy store of an object can increase.
If it speeds up or increases in mass
Describe how the kinetic energy store of an object can decrease.
If it slows down or decreases in mass
Describe how the elastic potential energy store of an object can decrease.
By allowing an elastic object to return to its original size/shape.
Describe how the thermal (internal) energy store of an object can increase.
Increase in temperature or a change of state (solid→liquid→gas)
Describe how the thermal (internal) energy store of an object can decrease.
Decrease in temperature or a change in state (gas→liquid→solid)
Describe how the chemical energy store can change.
Through chemical reactions.
Describe how the magnetic energy store can change.
Changes to the strength of a magnetic field.
Give an example of a chemical energy store.
Fuel
Food
Batteries
Describe how the electrostatic energy store can change.
Changes to the strength of an electric field.
What is an energy pathway (transfer)?
How energy is moved from one energy store to another?
Describe how the nuclear energy store can change.
Changes in the nucleus of atoms.
