Q3. (a) The pictures show four objects. Each object has had its shape changed. Bent metal ruler A Stretched bungee cords B Springs on a playground ride C Moulded plastic model car body D Which of the objects are storing elastic potential energy? Explain the reason for your choice or choices. (b) A student makes a simple spring balance. To make a scale, the student uses a range of weights. Each weight is put onto the spring and the position of the pointer marked 25 25 20 Distance 15 15 pointer moves in cm 10 5 0 Spring Weights 9 10 -11 12 -13 -14 15 16 17 18 -19 -20 -21 22 -23 -24 -25 Pointer The graph below shows how increasing the weight made the pointer move further. 0 1 2 3 4 5 Weight (1) Which one of the following is the unit of weight?. Draw a ring around your answer. (i) Which one of the following is the unit of weight?.. Draw a ring around your answer. (ii) What range of weights did the student use? joule wwwwood kilogram newton watt (iii) How far does the pointer move when 4 units of weight are on the spring? (iv) The student ties a stone to the spring. The spring stretches 10 cm. What is the weight of the stone?