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Forces (Weight (Weight = Mass x GFS, The weight of an object is the force…
Forces
Weight
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- The weight of an object is the force acting on the object due to gravity. It's mass is the quantity of matter in the object
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- The greater the resultant force on an object, the greater the object's acceleration
- The resultant force acting on an object is F= ma
Force multipliers
- The lever increases as force is applied to the object
- The turning effect is equal
- The effort is applied further from the pivot that the lead
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- The force on the load is more
Forces
- Scalar = A physical quantity, such as mass or energy, that has a magnitude only (no direction)
- Vector = A physical quantity, such as velocity, that has a magnitude and a direction
- Displacement is a distance in given direction
- Magnitude = The size or amount of a physical quantity
Moments
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- Principle of moments: The object will balance if: The total clockwise moment about the pivot equals the total Anti-Clockwise moment about the same pivot
Centre of mass
Freely suspended = When an object is suspended from a point around which it can freely turn, the centre of mass will be directly below the suspension point.
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- The centre of mass of a uniform ruler is at it's midpoint
- The centre of mass of a symmetrical object is along the axis of symmetry
Pressure
- Pressure is the force per unit area
- Sharp objects apply more pressure because they have a small surface area for a given force
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