Physics Flashcards
Energyyy
Energy
Gives us the ability to do work.
Kinectic energy
The energy of movement.
Extra info : The faster an object moves the more kinetic energy it has.
Heat/Thermal Energy
Energy that comes from anything giving heat.
Sound Energy
The energy that air has when it is vibrating, which your ears and brain interpret as sounds.
Electrical Energy
Energy coming from power stations or power outlets.
Light energy
Energy of light.
Mechanical Energy
The energy of an object in motion or the energy that is stored in objects by their position.
Stored Energy/Potential Energy:
🟢Energy that is stored away for later use.
Energy that has the potential to become one of the forms of energy.
Potential Chemical Energy
Energy that is stored in substances/ chemicals.
Example: Food, wood, Petrol/fuel.
Potential Gravitational Energy
Energy that is stored in an object when it’s above the ground.
Extra Info: The higher an object is the more gravitational potential energy it has.
Potential Elastic Energy
Energy that is stored in a stretched or squashed spring.
Potential Nuclear Energy
Energy that is stored inside tiny atoms that make up all matter.
What units is energy measured in?
Joules (J)
1 kilojoule (Kg) = ?
1000 joules (j)
Energy Transformation
When a form of energy is changes into a different form of energy.
Energy Transfer
When energy is transferred from one object to another.
Gravitational Potential Energy Equations:
Ep= mgh or Gravitational Potential energy = mass x gravity x height
Steps when calculating
- Write equation down
- Convert–> m=kg , h= m
- Fill-in. G=9.8, m=?, h=?
4 .Calculate ( final)
Kinetic Energy Equation
Ek= 1/2 x m x v²
The law of conservation
Energy cannot be created or destroyed, it can only be transformed and transferred.
Heat Transfer
When heat is transferred from one thing to another.
Conduction
When heat is transferred between two objects that come in contact with eachother.
Convention
When heat is transferred by heat flowing through liquid and gases. This is what causes heat to rise.
Radiation
Heat that spreads outwards from any hot object.
For example, the sun radiates heat, so when you stand outside you can feel the heat.
J –> Kj
divide by 1000
Kj–> J
x 1000
kj–>Mj
divide 1000
Mj–> kj
x1000
Efficiency formula
Useful energy out ÷ Total energy in x 100
Joules–> define
How much energy is needed to lift one 100g apple off the ground
