Physics Notes
Energy,Work and Power
Definition:
Energy is defined as the capacity to do work.
SI unit → joule [J]
Kinetic Energy[EK*]
*K is a subscript. Like H2O not H2O.
Kinetic Energy is the energy a body possess due to its motion
Any moving object has Kinetic Energy.
Formula → ½ mv2 [1/2 × mass × velocity square]
Potential Energy[Ep*]
*P is a subscript. Like H2O not H2O.
Potential Energy is the energy stored in an object due to is position, state or shape
Compressed Spring or a stretched bowstring has elastic potential energy
substances that can be burned have chemical potential energy.
Objects placed at a height is known as gravitational potential energy.
gravitational potential energy is the energy which a body possesses because of its position relative to the ground.
formula: mgh [mass×gravity{10 if it is on earth,otherwise stated}×height]
Principal Of Energy
- Energy cannot be created or destroyed
- must it can change its form.
Work
Work is done on an object when energy is transfered to that object.
Work done = Force × Distance
Power
- Power is the rate of work done
- Power = Work done ÷ time
- SI Unit for power is Watt[W]
- 1 Watt = 1 J/s
Please complete the notes
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