1. ENERGY – PART 2 1 – WHAT IS ENERGY? 2 – FORMS OF ENERGY
3 – ENERGY TRANSFORMATION
4 – ENERGY TRANSFER

2. WHAT IS ENERGY? INTERNATIONAL SYSTEM OF UNITS –
1 (joule) represents the energy needed to lift an object weighing 1 (newton) to a height of 1 (meter)
1 N = 100 g
1 M = 100 cm
1 J = 100g x 100cm
1J = 1N x 1M

3. WHAT IS ENERGY? Energy is the capacity to do work or effect a change.
In the international system of units, energy is expressed in joules.
Pg. 34 Textbook

4. FORMS OF ENERGY ENERGY FORM ENERGY SOURCE SOLAR ENERGY SUN
ELASTIC ENERGY
WIRE SPRING
ELECTRICAL ENERGY
POWER STATION
THERMAL ENERGY
FIRE
RADIANT ENERGY
ELECTRIC LIGHT BULB
CHEMICAL ENERGY
LIVING CELL
MECHANICAL ENERGY
MOVING VEHICLE
WIND ENERGY
WIND
SOUND ENERGY
SOUND
HYDRAULIC ENERGY
WATERFALL / CURRENT
NUCLEAR ENERGY
NUCLEUS OF AN ATOM
KINETIC ENERGY
POTENTIAL ENERGY

5. FORMS OF ENERGY Thermal Energy
Thermal energy: is the energy that comes from the random motion of particles that make up a substance. The higher the temperature of a substance, the more energy it contains because there is greater movement of its particles.
Warm
Cold
Pg. 36 Textbook

6. FORMS OF ENERGY Radiant energy
Radiant Energy: is the kind of energy contained in and transported by electromagnetic waves. The quantity of energy depends on the wavelength :the shorter the wavelength, the more energy the wave can transport. The quantity of energy also depends on the quantity of energy emitted by the source : the more radiation emitted, the greater the energy emitted as well.
Shorter wavelength
= Greater its energy
Pg. 37 Textbook

7. FORMS OF ENERGY Chemical Energy
Chemical Energy: is contained in the bonds of a molecule. It is energy in reverse, since the bonds need to be broken to free the energy they contain. The amount of energy depends on the strength of the bonds between the atoms. The stronger the bond the more energy it contains.
Pg. 38 Textbook

8. FORMS OF ENERGY Mechanical Energy
Mechanical energy: is the energy that results from the forces acting on an object. It depends on the objects speed, its mass and its relationship to its surroundings.
Pg. 39 Textbook

9. & Energy Transformation
Energy Transfer
& Energy Transformation
GOING FROM ONE SOURCE
TO THE NEXT
CHANGING FROM ONE SOURCE
TO ANOTHER

10. ENERGY TRANSFER
A movement of energy from one place to another while maintaining it’s form
Ex. Mechanical energy of a car’s motor is transferred to mechanical energy to the car’s tires to move the car.

11. Energy Transfer
Energy transfer is the movement of energy from one place to another. For example; from the sun to the leaves on a tree.
Most of the time, energy transformation and transfer occur at the same time.
Pg. 41 Textbook

12. ENERGY TRANSFORMATION
Changing energy from one form of energy to another form of energy
Ex. A Burning log – molecules of log transform into radiant energy (light) & thermal energy (heat)

13. Energy transformation and transfer
The transformation of energy is the changing of energy from one form to another; for example from chemical energy to mechanical energy.
Pg. 41 Textbook

14. Energy Transformation & Energy Transfer
Energy transformation and transfer help to carry out different kinds of change ; for example, physical changes and chemical changes.

15. HEAT HEAT – The transfer of thermal energy from one place to another.
Heat will always travel from the hotter place towards the colder place

16. KINETIC vs. POTENTIAL ENERGY
Kinetic Energy is the energy that an object possesses because of its motion.
Potential Energy is the energy that an object possesses because of its position and/or mass and/or arrangement of particles in its system