Forces/Pressure

Get Started. It's Free Forces/Pressure 1. How can we measure a force?

1.1. Forces are measured with force-meters. Spring balances are force-meters. -Extension spring balances -Compression spring balances

1.1.1. 1) In a compression spring balance, the spring is compressed when a force acts on it. 2) In a compression spring balance, the spring is compressed when a force acts on it.

3. What is a force?

3.1. A force is a push or pull. Whenever we push or pull something, we are said to exert a force.

3.1.1. Lifting/ bending/ stretching/twisting/ squeezing involves pushes and pulls

5. How can we decrease pressure?

5.1. To reduce pressure, increase the area of the object to exert lesser pressure.

5.1.1. for example, a camel has large feet so the pressure exerted will be reduced and the camel will not sink into the sand.

6. How to calculate pressure?

6.1. To calculate pressure we use the formula : force/Area

6.1.1. The unit of pressure is N/m2 also known as pascal. Pascal is the SI unit for pressure. For example a hippopotamus weighs 40000N it stands on one foot on the ground what is the pressure? 40000N = 40/cm2 1000cm2

7. How can we increase pressure?

7.1. to increase pressure you reduce the area of the object to exert more pressure.

7.1.1. for example, a sharp knife will exert more pressure than a blunt knife.

10. Different type of forces

10.1. Frictional force

10.1.1. Magnetic force

10.1.1.1. Gravitational force

11. Effects of the different forces

11.1. Frictional force: Also called friction Occurs when two moving surfaces are in contact Effects: Slows down and/or stops a moving object Produces heat

11.1.1. Magnetic force:Force exerted by a magnet on a magnetic material (e.g. iron and steel) or another magnet. Forces between magnets: Like poles repel: Magnets push away from one another Unlike poles attract: Magnets pull towards each other

11.1.1.1. Gravitational foce: Also called gravity Exists between any two objects This is the force that causes all objects to be attracted to the Earth.