1. Energy and Machines
Cp 5

2. Why does the nutcracker work better than just your hands?
Work is made easier by changing size or direction of the force!
What forms are energy are created during this work?

3. How to keep a bike moving.
Chemical _________ by _________.
Kinetic _________, by pushing them.
Pedals transfer to __________, which transfers to __________.
The _______moves and transfers energy to the back ___________, which gets you moving!!

4. Machines are converters.
While riding a bike, what other energy transfers might you observe?
Sound?_________ ____________
_________
Some KE Sound.
Explain the energy transfer in the toy you are give.

5. Machines are converters
These machines are designed to be energy converters. What useful conversions do they perform?

7. Energy conversions

8. Why do we need energy conversions?
To heat
Capturing suns energy. (Photosynthesis)
To eat for life.
To grow from energy
Electrical to cook.

9. Making Energy Useful
The electric energy can be used to cook, heat…

10. Energy Efficiency
Total energy input = useful energy + wasted energy

13. Directed Reading