Forces and Pressure

1. Forces

1.1. A push or pull

1.2. Cannot be seen but can be felt

1.3. Effects of forces

1.3.1. Change the speed of a moving object, either by the increasing its speed or slowing it down

1.3.2. Change the shape or size of an object

1.3.3. Start an object moving or stop a moving object

1.3.4. Change the direction of a moving object

1.4. S1 Unit: Newton

1.5. Types of Forces

1.5.1. Frictional Force

1.5.1.1. Occurs whenever two moving surfaces are in contact

1.5.2. Magnetic Force

1.5.2.1. The force of attraction that is produced by magnets

1.5.3. Gravitational force

1.5.3.1. A force that pulls an object towards the Earth

2. Pressure

2.1. Pressure is the force exerted per unit area

2.2. Pressure increases when force increases or area decreases

2.3. S1 Unit: Pascal (Pa)

2.4. Pressure= Force/Area