1. Pressure
1.1. It is the amount of force acting per unit area.
1.2. To increase pressure, the surface area has to decrease.
1.3. Calculating pressure
1.3.1. Force over area(force/area)
1.3.2. Example for calculating pressure:
1.3.2.1. Eg. A hippo. Weighs 30000N. It stands on 1 feet with an area of 1000cm sq. What is the pressure on the ground?
1.3.2.2. The answer: We use the formula force/area. Thus the answer is 30000N/1000cm sq = 30N/cm sq
1.4. objects with high pressure
1.4.1. sharp knife
1.4.1.1. has a higher pressure as there is more force applied on that small surface area.
1.4.2. high heels
1.5. Objects with a lower pressure
1.5.1. blunt knife
1.5.2. camel feet
2. New node
3. Force
3.1. S1 unit: Newton
3.2. Symbol: N
3.3. Effects of a force
3.3.1. can move an object
3.3.2. can stop an object
3.3.3. can change the speed of a moving object
3.3.4. can change the direction of the moving object
3.4. Types of forces
3.4.1. Frictional force
3.4.1.1. Created by 2 surfaces in contact with one another
3.4.2. Magnetic force
3.4.2.1. A force with which a magnet attracts an object
3.4.3. Gravitational force
3.4.3.1. A force that causes objects to be attracted to the Earth(due to gravity)
3.4.3.2. Measured in newtons