Review for test on Friday !

Force A push or a pull

Energy The ability to cause change

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?

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

The 3 laws of motion Developed by Isaac Newton

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

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

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

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