1. Pressure
1.1. What is pressure
1.1.1. Pressure is the amount of force per unit area
1.1.2. Decreasing Pressure
1.1.2.1. Increase area
1.1.3. Increasing Pressure
1.1.3.1. Decrease area
2. Forces
2.1. What is a force?
2.1.1. A push or pull
2.1.1.1. Lifting
2.1.1.2. Twisting
2.1.1.2.1. New node
2.1.1.3. Bending
2.1.1.4. Stretching
2.1.2. When we push or pull something we exert force
2.2. Effects of force
2.2.1. We cannot see the force only its effects
2.2.2. What are the effects
2.2.2.1. Changing the speed of a moving object
2.2.2.2. Changing size and shape
2.2.2.3. Start a stationery object to move or stop a moving object
2.2.2.4. Changing the direction of a moving object
2.3. Measuring Force
2.3.1. Measure using a spring balance
2.3.1.1. Compression
2.3.1.2. Expansion
2.3.2. Unit: Newtons(N) named after the English Scientist Sir Issac Newton
2.4. important types of forces
2.4.1. Frictional
2.4.2. Gravitational
2.4.3. Magnetic