Forces
- Created by: Laylawheeldon
- Created on: 24-03-14 19:57
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- FORCES
- gravity
- All objects have a force that attracts them towards each other. This is called gravity
- Gravitational force increases when
- the objects are closer
- the masses are bigger
- Gravity is a force that un-noticably pulls you down (to the centre of the earth)
- The Moon's gravity is one sixth of the Earth's gravity
- wieght
- Weight is a force caused by gravity
- The more mass the object has the greater its weight will be
- Weight is measured in newtons
- On the surface of the Earth an object with a mass of 1 kg has a weight of about 10 N
- mass
- The mass of an object is the amount of matter
- The more matter an object contains, the greater its mass
- Mass is measured in kilograms, kg, or grams, g
- push
- pull
- NOTE
- Remember that mass is measured in kilograms, kg, and weight is measured in newtons, N
- The weight of an object changes if the strength of gravity changes
- Pressure
- Equation - pressure = force ÷ area = ...nm2/pa
- Frictional Forces
- friction between tyres and the road stop cars from skidding
- friction between the brakes and wheel help bikes and cars slow down
- friction between our shoes and the floor stop us from slipping
- air resistance
- air resistance is caused by air against the fast moving object
- The faster the vehicle moves, the bigger the air resistance becomes
- Streamlined
- Streamling in where an object is specifically shaped to let the air flow past/over the object
- gravity
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