Equilibrium and Forces Revision 0.0 / 5 PhysicsForcesASAQA Created by: Kelsie_Em182Created on: 08-10-14 19:53 What are the two conditions for equilibrium? No resultant force and no resultant moment 1 of 10 What is the principle of moments? For an object not to rotate. Equal forces on both sides and everything is level 2 of 10 What is stable equilibrium? If tilted, the object will move back to its original position without toppling 3 of 10 What is unstable equilibrium? If tilted even slightly, the object will topple one way or another 4 of 10 How do you work out a moment? Force x Perpendicular distance between the pivot and the line of action of the force (M = F x d) 5 of 10 What is the definition of centre of mass? The centre of mass of a body is the point where a single force on the body has no turning effect 6 of 10 What is the definition of centre of gravity? A point from which the weight of a body may be considered to act. In uniform gravity, it is the same as the centre of mass 7 of 10 How do you work out the moment of a Couple? One force x Distance between the two forces 8 of 10 What is a Couple? A pair of equal and opposite forces acting on a body but not along the same line 9 of 10 What is the equation that fits with the principle of moments? What is the equation that fits with the principle of moments? 10 of 10

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