Force and Pressure

1. Force

1.1. A force is a push or a pull

1.2. Types of forces

1.2.1. Gravitational force

1.2.1.1. Acts on everything.

1.2.2. Frictional force

1.2.2.1. Exists between two objects

1.2.3. Magnetic force

1.2.3.1. Exists where there's a magnet

1.2.3.2. like poles repel, unlike poles attract.

1.3. Effects of a force

1.3.1. Make an object speed up

1.3.2. Make an object slow down

1.3.3. Change an object's direction

1.3.4. Change an object's shape

1.4. Measuring instruments

1.4.1. Spring balances

1.4.1.1. Compressed spring balance

1.4.1.2. Extension spring balance

1.4.2. Dynamometer

2. Pressure

2.1. force per unit area applied perpendicularly to the surface of an object

2.2. SI unit

2.2.1. Pascal

2.2.2. N/m²

2.3. Can be increased by decreasing the surface area of contact

2.4. Can be decreased by increasing the surface area of contact