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(b) Fig 8.1 shows a spanner being used to unscrew a nut from a bolt. (c) (í) 6 cm A 10 cm B Fig 8.1 Explain why it is better to push the spanner at B rather than at A. (The arrows marked A and B show the direction of the applied forces.) [1] (ii) A force of 120 N is applied at B. Calculate the moment of this force about the centre of the bolt. 132 (ii) Moment of force = .Nm [2] The nut and bolt are so rusty that the nut cannot be turned. What effect may be produced on the nut and bolt by the application of the force? .[1] Fig 8.2 shows two masses which are suspended at the ends of a metal beam which is 2m long. P 790g 2m pivot Q 1225 g Fig. 8.2 The beam is pivoted 1.2m from end P. Assuming that the beam is perfectly balanced on the pivot, calculate the mass of the metal beam.
Sagot :
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