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7 Cards in this Set
- Front
- Back
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equilibrium |
state where the relevant physical properties of a system are balanced
- forces are balanced - no resultant moment (net moment = 0) |
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moment |
moment = force X perpendicular distance from point to line of action of force
- SI unit: Nm - turning effect = moment = torque - when perpendicular distance is greatest (furthest from pivot), small force is needed to produce big moment |
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determining direction |
1) locate force 2) locate pivot |
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determining distance |
1) locate pivot & force 2) draw line from pivot to line of action of force 3) draw dotted line connecting force to pivot perpendicularly |
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principle of moments |
when a body is in equilibrium, sum of clockwise moment = sum of anticlockwise moment
F1 X D1 = F2 X D2 |
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center of gravity |
- point where the whole weight acts on to orientate the object - position of center of gravity affects its stability - when pivot is not at center of gravity, sum of moment will cause object to rotate |
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stability |
- measure of a body's ability to maintain its original position - stable : object always returns to original point after being displaced slightly - neutral : if displaced, object will remain where it is displaced - unstable : object continuously moves - increase stability by increasing base area & lowering center of gravity
instability - when an object is pushed until the line of action of the force acting on it is beyond the area of its base, the object wil topple over |
