Force and pressure

1. Force

1.1. A force is a push or a pull that one object exerts on one another.

1.1.1. New node

1.2. Forces cannot be seen but their effects can be seen and felt

1.3. When we push a plasticine ball, it starts to roll. A force can make an object move.

1.4. Force=mass x acceleration

1.5. The standard unit for force is :Newton (N)

1.6. Types

1.6.1. Magnetic force

1.6.1.1. Magnetic force is present when magnets or magnetized metals attract other magnetic materials

1.6.2. Friction

1.6.2.1. Friction is the force  resisting the relative motion of solid surfaces, fluid layers, and material elements sliding against each other

1.6.3. Gravitational force

2. Pressure

2.1. Pressure is the amount of force exerted per area

2.1.1. Pressure= Force/Area

2.2. The unit of force is newton(N)

2.3. You can reduce pressure by increasing the surface area of the object.

2.4. You can decrease pressure by decrease surface area of the object.

2.5. 1pascal=1 newton per meter square

2.6. Pascal is the SI unit for pressure