Concept and Forms of Energy

• Energy is the ability to do work.
• Energy can be transformed between forms without loss.

Concept of Energy

• Energy's effect on systems is what can be observed.
• A car is a system where the energy of its parts affects the whole.
• The movement of car parts causes the car to move.
• Heat from the engine and the switching on of lights are examples of energy.
• Energy is the ability to do work, and exists in different forms.

Forms of Energy

• Kinetic energy is the energy an object possesses when moving, also known as movement energy.
• Moving objects have kinetic energy.
• Increased molecular movement from heating increases Kinetic energy.
• Heat energy transfers from hotter to cooler objects.
• Heating an object increases the kinetic energy of its particles, increasing their movement speed.
• Cooling an object decreases the heat energy of its particles, slowing them.
• Higher heat energy correlates to higher temperature.
• The sun and fuel combustion are the main sources of grid energy.
• Potential energy is stored energy that can be released to do work.
• Lifting an object above the Earth's surface gives it gravitational potential energy.
• An object will be pulled back by gravity if released.
• The higher an object is lifted, the more potential energy it gains.
• Heavier objects gain more gravitational potential energy when lifted.
• Gravitational potential energy depends on an object's mass, height above the earth, and the force of gravity.
• Potential energy converts to kinetic energy as an object falls.
• Chemical potential energy is another type of potential energy, such as petrol, paraffin to release energy
• Chemical sentential energy is released when food molecules are burned during respiration
• Energy produced enables cells to do work.