GCSE Stienor Qucstions Pack 5 Unit 3 Equilibrium and Turning Forces The centre o
ID: 1876808 • Letter: G
Question
GCSE Stienor Qucstions Pack 5 Unit 3 Equilibrium and Turning Forces The centre of gravity of an object is the point through which the whole weight of the object seems to act. A metre stick supported above its centre of gravity will be level-in equilibrium; but if it is held somewhere ese it will be unstable and tip over. Centre of gravity In equilsbrium Centre of gravity Unstable The object A will keep upright-be in stable equilibrium when its centre of gravity acts downwards through its base. But if is tipped over too far, the centre of gravity acts outside its base (B) and it topples over it was tipped into a position of unstable equilibrium. A ball resting on a horizontal surface is always in neutral equilibrium because its centre of gravity always acts through its base, the point at which it touches the surface. The turning effect of a force is called a MOMENT. If we open a door, steer a car or use a spanner we are employing the turning effect of a force. The MOMENT of a force -FORCE x DISTANCHE Nm) (rm) The distance is measured from the point where the force is acting to the pivot Principle of Moments Clockwise moment The Principle of Moments says that: In equilibrium (or balance) The total anticlockwise momentThe total clockwise moment. 0.55 m 033m 300 N-' W 500 N Nm) 0.55 165Explanation / Answer
1.
D
2. center of mass must be at lower position
B
3. Since the center of mass is towards left so it will topple to same side
A
4. By torque balance
200* 30 = 300* x
x = 20 cm
5. By torque balance
M* (80 - 50) = 90 * (50 - 10)
M = 120 g
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