E N E R G Y

physics: energy, forces

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E N E R G Y by Mind Map: E N E R G Y

1. Stores

1.1. Gravitational potential energy (Ep = m * g * h)

1.2. Kinetic (Ek = 1/2 * m * v2)

1.3. Elastic potential energy (Ee = 1/2 * k * e2)

1.3.1. K = force (N) / extension

1.4. Thermal

1.4.1. specific heat capacity

1.4.1.1. E = m * cap * ▲B

1.5. Power

1.5.1. rate of energy transfer

1.5.1.1. w = e / t

2. law of conservation of energy

2.1. transfer of energy by force

2.1.1. work done ( W = F * D)

2.1.2. friction

2.2. dissipation of energy

2.2.1. total energy

2.2.1.1. useful energy + wasted energy

2.2.1.1.1. surroundings heat up

2.2.2. Efficiency

2.2.2.1. useful energy / total energy

2.2.2.2. saving energy

2.2.2.2.1. houses

2.2.2.2.2. machines

3. R Practical: measuring specific heat capacity

4. R Practical: Insulators, energy efficiency