1. Review for test on Friday !

2. Force A push or a pull

3. Energy The ability to cause change

4. Work When a force moves an object over a distance An object MUST BE MOVED Work = force x distance I push a book 3 m across the floor. I use 4 N of force. How much work was done?

5. The Law of Conservation of Energy Energy cannot be created or destroyed, but changes form Chemical energy – stored in plants Light energy from the sun Sound energy – from vibrations Electrical energy – moving particles Nuclear energy – energy stored in nucleus of an atom Mechanical energy – energy of motion doing work Heat energy – thermal energy

6. The 3 laws of motion Developed by Isaac Newton

7. Measurement Spring scale is used to measure force Force is measured in Newtons Work is measured in Joules

8. Inclined Plane Simple tool – ramp Makes force less, but distance longer

9. Tropisms Plant’s response to light – Phototropism Plant’s response to gravity – Geotropism/gravitropism Plant’s response to touch - Thigmotropism

10. Turgor Pressure Water pressure inside plant’s cells Low – plant wilts High – plant stands tall