FORCE AND PRESSURE
作者：TAY YU JIE .
1. Pressure
1.1. Pressure is the amount of force exerted perpendicularly per unit area.
1.2. the S.I. unit of pressure is Pascal (Pa)/ Newton per metre square (N/m2).
1.3. pressure = force/area
1.3.1. to increase: 1. Increase force 2. Decrease area
1.3.2. to decrease pressure: 1. Decrease force 2. Increase area
2. FORCE
2.1. Force is a push or a pull
2.2. Force can cause things to change shape, chang speed, change direction and cause things to start or stop moving (changing motion)
2.3. We can measure force by using a force meter.
2.4. Important forces around us
2.4.1. Gravitational Force
2.4.1.1. is gravity which pulls all objects down to earth
2.4.1.2. The greater the gravitational force, the heavier an object would weigh.
2.4.2. Magnetic Force
2.4.2.1. Magnetic force is the attraction/repulsion between a magnet and an object made of magnetic material or another magnet.
2.4.2.1.1. Pull: Attraction Push: Repulsion
2.4.3. Frictional Force
2.4.3.1. Frictional force is the force when two objects.
2.4.3.2. opposes motion