Work Energy Power

Work §

Work is the energy transfer that takes place when a force causes an object to move.

Very important formula for work:

No work is done when:

1. Direction of the applied force and the direction in which the object moves are perpendicular to each other

   1. Why???
   2. Sub theta = 90

2. The force is applied on the object but the object does not move.

   1. Energy from hand for holding books up → heat energy

Work is done when:

1. Object moving horizontally
2. Object moving vertically

Energy §

Types of energy:

• Kinetic Energy
• Gravitational Potential Energy
• Elastic Potential Energy
• Chemical Potential Energy
• Nuclear (Potential) Energy

Gravitational Potential Energy §

Formula: Maximum GPE when at highest point of jump

Kinetic Energy §

Formula:

Energy Transfer §

Energy is transferred to another form when work is done.

Conservation of Energy §

Energy cannot be created or destroyed.

Power §

Formula: Unit: watt

Sources of Energy §

Renewable Energy §

• Biofuel
• Geothermal
• Hydroelectric
• Wind
• Solar

Non-renewable Energy §

• Coal
• Nuclear