(a) State Hooke's Law. (b) For forces up to 120 N, a spring obeys Hooke's Law....

 

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(a) State Hooke's Law. (b) For forces up to 120 N, a spring obeys Hooke's Law. A force of 120 N causes an extension of 64 mm. (i) On Fig. 2.1. draw the force-extension graph for the spring for loads up to 120 N. 150- force/N 100- 50- 0- 20 40 Fig. 2.1 60 extension/mm 80 (ii) Calculate the spring constant & of the spring. (c) A student makes a spring balance using the spring in (b). The maximum reading of this balance is 150 N. The student tests his balance with a known weight of 140 N. He observes that the reading of the balance is not 140N. Suggest and explain why the reading is not 140 N. (a) State Hooke's Law. (b) For forces up to 120 N, a spring obeys Hooke's Law. A force of 120 N causes an extension of 64 mm. (i) On Fig. 2.1. draw the force-extension graph for the spring for loads up to 120 N. 150- force/N 100- 50- 0- 20 40 Fig. 2.1 60 extension/mm 80 (ii) Calculate the spring constant & of the spring. (c) A student makes a spring balance using the spring in (b). The maximum reading of this balance is 150 N. The student tests his balance with a known weight of 140 N. He observes that the reading of the balance is not 140N. Suggest and explain why the reading is not 140 N.