ENERGY&POWER

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ENERGY&POWER by Mind Map: ENERGY&POWER

1. A compressed or stretch spring possessed elastic potential energy.

1.1. Relationship between Work and Elastic Potential Energy

1.2. Elastic potential energy = work done = area under the graph = 1/2 Fx

2. WORK

2.1. Defined as the product of force, F, and displacement,S.

2.2. S.I. unit for work - joule (J).

2.3. 1 J = 1 Nm.

2.4. W = Fs

3. ENERGY

3.1. Defined as the ability to do work.

3.2. S.I. unit for energy is joule (J).

4. POWER

4.1. Defined as the rate of doing work, W,

4.2. The S.I. unit for power is watt (W)

4.3. 1 W = 1 J s–1

4.4. Power, P = Work done, w Time taken,t

5. GRAVITATIONAL POTENTIAL ENERGY

5.1. Is the work done to lift an object to a height, h from the Earth’s surface.

5.2. Gravitational potential energy = Work done

5.3. = Force (F) × Displacement (s) = mgh

6. ELASTIC POTENTIAL ENERGY

6.1. Is the work done to compress or stretch an elastic material with displacement x from the equilibrium position.

6.2. Elastic potential energy = Work done = Average force (N) × Displacement (m) = 1/2 Fx

6.2.1. F is the stretching or compression force in (N) X is the displacement from the equilibrium position in (M)

7. KINETIC ENERGY

7.1. Is the energy possessed by a moving object.

7.1.1. Kinetic energy = 1/2 mv2

7.1.2. m is mass in kg v is velocity in m s–1

8. PRINCIPLE OF CONSERVATION OF ENERGY

8.1. Energy cannot be created or destroyed but can only be converted from one form to another.

8.2. Useful energy is energy in a form that can be easily converted into other forms to do work.

8.3. In a closed system, the transformation of energy between potential energy and kinetic energy obeys the Principle of Conservation of Energy. Therefore, the total potential energy and kinetic energy in a closed oscillation system is constant.