1. Forces
1.1. Can
1.1.1. Change direction of moving object
1.1.2. Size and shape of object
1.1.3. Start an object moving
1.1.4. Stop a moving object
1.2. Is a push or pull
1.2.1. Lifting
1.2.2. Bending
1.2.3. Stretching
1.2.4. Twisting
1.2.5. Squeezing
2. Types of Forces
2.1. Gravitational
2.1.1. Force that attracts objects to Earth's core
2.2. Magnetic
2.2.1. Like poles repel, unlike poles attract
2.2.2. Is force exerted by a magnet on another magnetic material or magnet
2.2.3. Used in Maglev trains, fridges etc.
2.3. Frictional
2.3.1. Advantages
2.3.1.1. Enables us to walk
2.3.1.2. Allows us to grip things
2.3.2. Disadvantages
2.3.2.1. Causes unnecessary heat
2.3.2.2. Causes wear and tear
2.3.3. Ways to reduce friction
2.3.3.1. Ball bearings
2.3.3.2. Streamlining
2.3.3.3. Smooth surfaces
2.3.3.4. Lubricants
2.3.4. Is when two objects move across each other
3. Measured by
3.1. Newtons(N)
4. Instruments
4.1. Spring Balances
4.1.1. Compression (Push)
4.1.2. Extension (Pull)
5. Weight
5.1. Gravity acting on an object
5.1.1. Weight on Earth= Mass x 10
5.1.2. Weight on Moon= Weight on Earth x 1/6
6. Pressure
6.1. Force acting per unit area
6.2. Increases when
6.2.1. Force increases
6.2.2. Area Decreases