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P8: Forces in balance - Coggle Diagram
P8: Forces in balance
8.1 Vectors & Scalars
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Examples of vectors are: force or weight, velocity, displacement, acceleration, and momentum
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Examples of scalars are: mass, speed, distance, energy, and temperature
Vector quantity can be represented by and arrow in the direction and length in proportion to the magnitude
8.3 Resultant forces
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If resultant force is 0N, it will be at rest or moving at a constant speed & direction
If resultant force is 0 <, speed or direction will change
If 2 forces act along the same line in the same direction, the resultant force is their sum
If 2 forces act along the same line in opposite directions, the resultant force is their difference
8.4 Moments at Work
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to increase moment, increase force or distance
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8.9 Resolution of Forces
Resolving a force means finding perpendicular components that have a resultant force that is equal to the force
To resolve a force in 2 perpendicular directions, draw a rectangle with adjacent sides along the 2 directions so that the diagonal represents the force vector
For an object in equilibrium, resultant force is 0
8.6 Centre of Mass
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When an object is freely suspended, it comes to rest with the centre of mass directly underneath the point of suspension
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8.5 Levers & Gears
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Pivot of a force multiplier is nearer to the line of action of the force it exerts th\n the force applied to it
To increase the moment of a turning effect, a small gear wheel needs to drive a larger gear wheel