1. force
1.1. is a push or a pull
1.1.1. gravitational force
1.1.1.1. is the amount of pull on anything that keeps that object on earth
1.1.1.2. the amount of gravity on the object that keeps it moving
1.1.1.3. the weight of an object depends on the force of gravity in that object
1.1.2. magnetic force
1.1.2.1. a force which a magnet attracts an object
1.1.2.2. measured in newton (N)
1.1.2.3. uses of magnetic force
1.1.2.3.1. magnetic cranes are used to lift heavy trunks
1.1.2.3.2. ATM cards have a magnetic strip to store vital information
1.1.2.3.3. speakers have magnets in them which are used in converting electrical energy into mechanical energy
1.1.2.4. one example is the maglev train
1.1.3. frictional force
1.1.3.1. is a force that opposes motion between two objects
1.1.3.1.1. walking
1.1.3.1.2. air resistance
1.1.3.1.3. running
1.1.3.2. advantages
1.1.3.2.1. allows cars to not swerve easily on the road
1.1.3.2.2. ability to walk without slipping
1.1.3.2.3. writing
1.1.3.3. disadvantages
1.1.3.3.1. requires more energy to perform a working task
1.1.3.3.2. creates heat which can cause wear and tear or overheating of a part
1.1.3.3.3. reduces the longevity of an object
1.2. a force can:
1.2.1. change the shape of an object
1.2.2. move a stationary object
2. pressure
2.1. a certain amount of force applied on a certain amount of area
2.1.1. formula: force/area
2.1.2. unit for pressure: pascal (Pa)
2.2. examples of increasing pressure
2.2.1. press a tissue against a wound instead of just putting it on the wound
2.2.2. an aeroplane gets higher and higher up into the air as it takes off from the ground