Kinetic and Potential Energy Stores

Movement means energy in a object's kinetic energy store
1. Anything that's moving has energy in its kinetic energy store
2. Energy is transferred to the kinetic store when an object speeds up and is transferred away when it slows down
3. Energy in the kinetic store depends on the object's mass and speed
  1. The greater the mass and the faster it is, the more energy there will be
4. E(k) = 1/2MV^2
  1. Kinetic energy (j) = 1/2 * Mass (kg) * Speed (m/s) ^2
Raised objects store energy in gravitational potential energy stores
1. Lifting objects in a gravitational field requires work
  1. Causes a transfer of energy to the gravitational potential store of the raised object
    1. The higher the object is lifted, the more energy is transferred to the store
2. The amount of energy in a G.P.E store depends on the object's mass, height and the strength of the gravitational field the object is in
3. E(p) = MGH
  1. G.P.E (j) = Mass (kg) * Gravitational field strength (N/kg) * Height (m)
Falling objects also transfer energy
1. When something falls. energy from its gravitational potential store is transferred to its kinetic store
2. For a falling object when there's no air resistance:
  1. Energy lost from the G.P.E store = Energy gained in the kinetic store
3. In real life, air resistance acts against all falling objects
  1. Causes some energy to be transferred to other energy stores
    1. E.G, the thermal stores of the object and surroundings
Stretching can transfer energy to elastic potential energy stores
1. Stretching or squashing objects can transfer energy to its elastic potential store
  1. So as long as the limit of proportionality has not been exceeded, energy in the elastic potential store can be found using:
    1. E(e) = 1/2KE^2
      1. Elastic potential energy (j) = 1/2 * Spring constant (N/m) * Extension (m)

Next up

Kinetic and Potential Energy Stores

Description

Resource summary

Similar

	Created by Sharleen Tebb almost 7 years ago