1.The weight of an object is to be found using the balance shown in the diagram.



Weights in the right-hand pan Effect
0.1 N, 0.1 N, 0.05 N, 0.02 N balance tips down slightly on the left-hand side
0.2 N, 0.1 N, 0.01 N balance tips down slightly on the right-hand side

What is the best estimate of the weight of the object?


2.The diagram shows a force being applied to a lever to lift a heavy weight.


Which change would enable the heavy weight to be lifted with a smaller force?



3.The diagram shows a uniform half-metre rule balanced at its mid-point.


What is the weight of the metal block?


4.A flat lamina is freely suspended from point P. The weight of the lamina is 2.0 N and the centre of mass is at C.

 PC = 0.50 m

PQ = 0.40 m

QC = 0.30 m


The lamina is displaced to the position shown.

What is the moment that will cause the lamina to swing?


5.A piece of uniform card is suspended freely from a horizontal pin. At which of the points shown is its centre of gravity?



6.A uniform metre rule is balanced by a 4 N weight as shown in the diagram.


What is the weight W of the metre rule?

7. Which statement is true for a body in stable equilibrium?
8. Which statement is true for a body in unstable equilibrium?
9. How can the stability of an object be increased?
10. If the total clockwise moment around a pivot is 10Nm and the total moment about a pivot is 0, what is the size of the anticlockwise moment?

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