G481 - Mechanics - OCR Definitions - Forces in Action

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Last updated: December 4, 2014

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First submitted	December 4, 2014
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Average score	27.3%
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Hint	Answer
Braking Distance	The distance travelled by the car between the time of the brakes being applied and the car stopping
Thinking Distance	The distance travelled by the car in the time taken for the driver to react
Stopping Distance	Braking Distance + Thinking Distance
The Newton	The force required the accelerate a mass of 1kg to 1ms^-2
Principle of Moments	Sum of clockwise moments = Sum of anticlockwise moments (around a point)
Equilibrium	Net force acting on the object must be zero, net moment about any point must also be zero
Centre of Gravity	The point where an object's entire weight appears to act
A couple	A pair of equal and opposite forces separated by a distance
A torque of a couple	One of the forces multiplied by the perpendicular distance between the forces
Density	Mass per unit volume (Mass / Volume)
Pressure	The normal force per unit cross sectional area (Force/Area)

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