question_answer

  Look at the diagram below and answer the following questions. When a force is applied through the free end of the spring balance A, the reading on the spring balance A is 15 g wt. What will be the measure of the reading shown by spring balance B? Write reasons for your answer. Name the force which balance A exerts on balance B and the force of balance B on balance A.

Answer:

                  (i) 15gwt.                                                             (1) (ii) From Newton's third law, the force exerted by B on A and force exerted by A on B are equal.                                                                              (1) (iii) Force of reaction and force of action.  (1)