• Do Now: Do eclipse worksheet.
Both sides.
• LT: I can describe how energy is transformed from one form to another (PS3A).

Moving (kinetic) energy
• Light
• Thermal
• Electrical
• Mechanical
• Sound
Potential energy
• Chemical
• Gravitational
• Elastic
• Nuclear

Energy Transfer

An energy diagram for the bike would look like this :-
100 000 J
Chemical
Energy
80 000 J
Kinetic
8 000 J
Sound
12 000 J
Heat

What’s in The Box?
Energy out:
Sound energy
Energy in:
Electrical energy

What’s in The Box?
Energy out:
Energy in:
Sound energy
A radio converts electricity into sound
Electrical energy

What’s in The Box?
Energy out:
Heat energy
Energy in:
Electrical energy

What’s in The Box?
KS3 stuff!
Energy out:
Heat energy
A cooker converts electricity into heat
Energy in:
Electrical energy

What’s in The Box?
Energy out:
Light energy
Energy in:
Electrical energy

What’s in The Box?
KS3 stuff!
Energy out:
Light energy
A lamp converts electricity into light
Energy in:
Electrical energy

What’s in The Box?
Energy out:
Heat & Light energy
Energy in:
Chemical energy

What’s in The Box?
KS3 stuff!
Energy out:
Energy in:
Heat & Light energy A match converts chemical energy into light and heat
Chemical energy

What’s in The Box?
Energy out:
Light Energy
Energy in:
Electrical energy
Heat Energy

What’s in The Box?
Energy out:
Light Energy
Energy in:
Electrical energy
Heat Energy
Although a lamp is meant to transfer electrical energy into light it actually transfers most of the energy into wasted heat.

Energy Transfer

1. Write the LT in your own words.
2. What was the most important thing you learned today?
3. What are still the most unsure about?

• Sun > light energy> wheat >chemical energy> breakfast >mechanical energy> ride bike up hill >gravitational potential energy> coast downhill >kinetic energy> crash into tree >sound energy> leaves shake/windows rattle >

•
•
Matter? Everything in the Universe. Solid-liquid gas.
• Matter needs energy to change.
• Energy constantly changing
•
Never created/destroyed
•
Energy can be transferred
• Work: force working over a distance to move an object. A transfer of energy.
Also needs energy!
• …stacking boxes. Potential changed to kinetic
•
Potential energy: Position
—spring (elastic)—
• Law of conservation of mass and energy —Einstein—
– Ping pong/golf ball
– Heat transfer. Conduction, convection, radiation

In any energy change there is ALWAYS wasted energy
• When a zebra eats the grass, it does not obtain all of the energy the grass
• When a lion eats a zebra, it does not get all of the energy from the zebra
• Only 10% of the energy from one trophic level is transferred to the next – this is called the 10% law