science chapter F1 forces and pressure:)

1. Forces

1.1. what is a force?

1.1.1. it is a push or pull one object exerts on another

1.1.1.1. towards our body(pull)

1.1.1.2. from our body forward(push)

1.1.2. forces cannot be seen but its effects can be felt

1.2. what are the effects of forces?

1.2.1. make a stationary object move

1.2.2. cause a moving object to change dirrection

1.3. how can we measure a force?

1.3.1. in nuetons

2. 3 forces

2.1. gravity

2.1.1. from a height

2.1.2. uses of gravity

2.1.2.1. positive

2.1.2.1.1. we can stand without falling

2.1.2.2. negative

2.1.2.2.1. New node

2.2. friction

2.2.1. contact of 2 or more objects

2.2.1.1. effects

2.2.1.1.1. positive

2.2.1.1.2. negative

2.3. magnetism

2.3.1. a magnet and magnetic metal or object

2.3.1.1. effects

2.3.1.1.1. positive

2.3.1.1.2. negative

3. pressure

3.1. force per unit area

3.2. increase preasure

3.2.1. decrease surface area

3.3. formula for calculating pressure

3.3.1. force over area

3.4. si unit of measurment

3.4.1. Pascas