UNIT 1 PHYSICS - ENERGY TRANSFERS

FEB EXAM

What does the Conservation of Energy mean?

• Energy cannot be created

• Energy cannot be destroyed

• It can only change from one type to another (Energy is conserved - total amount stays the same)

Example of energy change: turning on a light bulb

Electrical energy →Light energy + Heat energy

What do electrical devices do?

They transform electrical energy into other forms (e.g. light, sound, heat)

Example: Television

Electrical energy →Light + Sound + Heat energy

What are thermal energy and heat energy?

The are the same thing!

What happens when a force moves an object through a distance?

Energy is transferred from one form to another

Example: A crane lifting an object

Chemical energy (in fuel) → Kinetic energy (movement) → Gravitational potential energy (lifted object)

Summary of energy transfer by force 

Energy fuel → makes crane move → lifts object → increases stored gravitational energy