FORCE & PRESSURE

1. Pressure

1.1. Force exerted per unit area

1.2. Increases when...

1.2.1. Force increases

1.2.2. area decreases

2. Force

2.1. SI Unit: Newton(N)

2.2. Push/Pull

2.2.1. Change shape/size of object

2.2.2. Start/Stop a moving object

2.2.3. Speed up/ Slow down moving object

2.2.4. Change direction of moving object

2.3. Kinds of forces

2.3.1. Magnetic force

2.3.1.1. The force of attraction produced by magnets on magnetic objects

2.3.2. Gravitational force

2.3.2.1. force that pulls objects towards the Earth

2.3.2.2. Force of gravity pulling down on object: weight

2.3.3. Frictional Force

2.3.3.1. Produced by 2 moving surfaces in contact

2.3.3.2. Useful

2.3.3.3. Nuisance

2.4. measured with

2.4.1. extension spring balance

2.4.2. compression spring balance