Force And Pressure

1. Force

1.1. Different types of forces

1.1.1. Gravity

1.1.1.1. is responsible for keeping the Earth and the other planets in their orbits around the Sun

1.1.1.2. Gravity is a force pulling together all matter. The more matter, the more gravity

1.1.1.3. Exists between any two objects

1.1.2. Friction

1.1.2.1. When surfaces in contact move relative to each other, the friction between the two surfaces converts kinetic energy into heat

1.1.2.2. Can cause wear and tear

1.1.2.3. Opposes motion

1.1.3. Magnetic force

1.1.3.1. acts at a distance

1.1.3.2. Like poles repel and unlike poles attract

2. Pressure

2.1. Pressure = Force / Area

2.2. SI Unit : Pascal (Pa)

2.3. Other Units : N/cm2

2.4. The smaller the surface area of an object, the greater the pressure and vice versa