Chapter 9 Review

Sec 2 LSS TOPICAL REVIEW 9 Chapter 9: Application of Forces and Transfer of Energy Name: __________________________ Class: ____________ Date: ____________ Section A: Multiple-Choice Questions (MCQs) – 6 marks 1 2 3 4 5 6 1 The diagram I below shows a spring before a force is applied. When a force is applied, the spring is stretched as shown in diagram II . Which of the following conclusions can be made about a force from diagrams I and II ? A A force can change the density of the spring. B A force can change the mass of the spring. C A force can change the motion of the spring. D A force can change the size of the spring. 2 A block of wood has a mass of 15 kg on Earth. What is its mass when it is placed in a planet which it experiences half of the Earth’s gravitational force? A 7.5 kg B 15 kg C 30 kg D 45 kg

Sec 2 LSS 3 Which of the following does not involve gravitational force? A a parachutist descending towards the ground B a rocket taking off from its base on Earth C a satellite orbiting around the earth D rise and fall in sea level 4 Which of the examples shows that work is not done? A dragging a load across a floor B kicking a ball away C leaning against a concrete wall D throwing an object up in the air 5 Which of the following statement about work done on an object is not correct? A There is work done if the object is being carried up the stairs. B The object must move in the direction of the force acted on it. C The SI unit of work done is Nm. D When the object remains stationary, there is no work done on the object. 6 The diagram below shows a ball rolling down a slope from point X to a horizontal surface at point Z . The slope and the horizontal surface are frictionless. What would be the total amount of energy at point Y during its journey? A 0 J B 250 J C 350 J D 600 J

Sec 2 LSS Section B: Structured Questions – 19 marks 1 State the effect of forces in the following situations. (a) Hitting a tennis ball during the games. ……………..……………..……………..……………..……………..………………. [1] (b) Punch a pillow. ……………..……………..……………..……………..……………..………………. [1] (c) Using a bottle opener to open the cap on the bottle. ……………..……………..……………..……………..……………..………………. [1] (d) Pushing a trolley after loading goods onto it ……………..……………..……………..……………..……………..………………. [1] 2 A student wrote ‘The weight of a table is 60 kg. However, the mass of the t