1. FORCE
1.1. is a push or pull
1.1.1. like actions such as
1.1.1.1. lifting
1.1.1.2. bending
1.1.1.3. stretching
1.1.1.4. twisting
1.1.1.5. squeezing
1.1.2. exerted when one thing interact with another
1.2. cannot be seen but the affects can be felt
1.2.1. change the speed of objects
1.2.2. change shape or size of an object
1.2.3. start or stop moving an object
1.2.4. change the direction of a moving object
1.3. measure force
1.3.1. force -meters
1.3.1.1. spring balances
1.3.1.1.1. extension spring balances
1.3.1.1.2. compression spring balances
1.3.2. SI unit
1.3.2.1. Newton
1.3.2.1.1. N
1.4. Type of forces
1.4.1. Frictional force (Friction)
1.4.1.1. occurs whenever two surfaces are in contact
1.4.1.2. slows down and stop a moving object
1.4.1.3. can be
1.4.1.3.1. useful
1.4.1.3.2. problem
1.4.2. Magnetic force
1.4.2.1. force exert by magnet
1.4.2.2. magnet
1.4.2.2.1. have 2 poles
1.4.3. Gravitational force( Gravity)
1.4.3.1. pulls object towards earth
1.4.3.2. exist between two objects
1.4.3.3. WEIGHT
1.4.3.3.1. depends on the force of gravity acting on that object
2. PRESSURE
2.1. the amount of force acting on an object per unit area
2.2. depend on
2.2.1. force
2.2.1.1. increase
2.2.1.1.1. pressure increase
2.2.2. area
2.2.2.1. decrease
2.2.2.1.1. pressure increase
2.2.2.1.2. when a smaller surface is in contact with an object, the pressure exerted on an object is higher
2.2.2.2. increasing
2.2.2.2.1. pressure decrease
2.2.2.2.2. when larger surface is in contact with the ground, the pressure exerted on the ground is lower
2.3. calculating pressure
2.3.1. pressure = force/area
2.3.2. unit
2.3.2.1. newton per square centimeter (n/cm2)
2.3.2.2. SI
2.3.2.2.1. Pascal (Pa)