Forces and Pressure

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Forces and Pressure

2. Forces

2.1. Types of forces

2.1.1. Frictional Force

2.1.1.1.1. Examples

2.1.1.2.1. Makes movement more difficult

2.1.1.2.2. Wears away materials

2.1.1.2.3. Produces unnecessary heat

2.1.1.3. Ways to reduce it

2.1.1.3.1. Using smooth surfaces

2.1.1.3.2. Ball bearings

2.1.1.3.3. Lubricants

2.1.1.3.4. Streamlining

2.1.1.4. Effects

2.1.1.4.1. Slows down and/or stop a moving object

2.1.1.4.2. Produces heat

2.1.2. Gravitational Force

2.1.2.1. definition

2.1.2.1.1. Causes objects to be attracted to the earth

2.1.2.1.2. exists between 2 objects

2.1.2.2. Weight

2.1.2.2.1. Gravitational force acting on a object/ Mass x gravitational pull of earth

2.1.2.2.2. Measured using Spring Balance in Newtons

2.1.3. Magnetic Force

2.1.3.1. Force exerted by a magnet on a magnetic material (e.g. iron and steel) or another magnet.

2.1.3.2. Bar magnet has 2 poles: North-seeking pole (N) South-seeking pole (S)

2.1.3.3. Like poles repel: Magnets push away from one another Unlike poles attract: Magnets pull towards each other

2.2. Effects of forces

2.2.1. Change in shape or size of an object

2.2.1.1. New node

2.2.2. Change direction of a moving object

2.2.3. Start an object moving

2.2.4. Stop a moving object

2.3. Is a push and pull

2.3.1. examples

2.3.1.1. Lifting

2.3.1.2. Bending

2.3.1.3. Stretching

2.3.1.4. Twisting

2.3.1.5. Squeezing

2.4. Units of force

2.4.1. SI Unit

2.4.1.1. Newton Symbol: N

2.5. Measuring Forces

2.5.1. Force Meter

2.5.2. Newton Meter

2.5.3. Spring Balance

2.5.3.1. Compression

2.5.3.1.1. The spring compresses when a force push on it The greater the force, the more the spring compresses

2.5.3.2. Extension

2.5.3.2.1. The spring stretches when a force pull on it The greater the force, the more the spring stretches

3. Pressure

3.2. increases when

3.2.1. The force increases

3.2.2. The area decreases

4. High Pressure

4.1. Reducing contact area for more force to be focus on a small area

4.1.1. example

4.1.1.1. cutting an object with a sharp knife