FORCES AND PRESSURE:)
by ONG YING HERN .
1. WHAT IS A FORCE?
1.1. Defination: push or a pull
1.2. Everything we do needs a force
1.3. A force is exerted when two things interect with each other
2. Effects of a force
2.1. A force can:
2.1.1. Change the shape of an object
2.1.2. Move an object
2.1.3. Change the size of an object
2.1.4. Stop an object
2.1.5. Speed up the speed of a moving object
2.1.6. Chang ethe direction of an object
3. Forces are measured by force meter(spring balances)
3.1. Extension and compression spring balance
3.1.1. spring stretches when a force is on it(extension spring balance)
3.1.2. Spring compresses when a force is on it( compression spring balance)
4. SI unit is newtons and its symbol is N
5. Pressure
5.1. The amount of force applied to per unit area
5.2. Can increase pressure by decreasing the area of the force
5.3. Can decrease pressure by increasing the area of the force
6. Types of forces
6.1. Frictional force
6.1.1. Decrease by:
6.1.1.1. applying lubricant
6.1.1.2. ball bearings
6.1.1.3. smoothen the surface(sandpaper)
6.2. magnetic force
6.2.1. Attraction and repulsion
6.3. gravitational force
6.3.1. Also known as mass
6.3.1.1. mass and weight are different
6.3.1.1.1. Mass is the amount of matter in inside an object while weight is the amount of gravitational force pulling on an object