Forces and Pressure

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Forces and Pressure by Mind Map: Forces and Pressure

1. Low Pressure

1.1. Increasing contact area such that force is not focused on one small area

2. Forces

2.1. Types of forces

2.1.1. Frictional Force Advantages Examples Disadvantages Makes movement more difficult Wears away materials Produces unnecessary heat Ways to reduce it Using smooth surfaces Ball bearings Lubricants Streamlining Effects Slows down and/or stop a moving object Produces heat

2.1.2. Gravitational Force definition Causes objects to be attracted to the earth exists between 2 objects Weight Gravitational force acting on a object/ Mass x gravitational pull of earth Measured using Spring Balance in Newtons

2.1.3. Magnetic Force Force exerted by a magnet on a magnetic material (e.g. iron and steel) or another magnet. Bar magnet has 2 poles: North-seeking pole (N) South-seeking pole (S) 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 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 Lifting Bending Stretching Twisting Squeezing

2.4. Units of force

2.4.1. SI Unit Newton Symbol: N

2.5. Measuring Forces

2.5.1. Force Meter

2.5.2. Newton Meter

2.5.3. Spring Balance Compression The spring compresses when a force push on it The greater the force, the more the spring compresses Extension The spring stretches when a force pull on it The greater the force, the more the spring stretches

3. Pressure

3.1. Pressure is the force acting per unit area.

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 cutting an object with a sharp knife