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 table depends on where it is – high up in the mountains or at sea level.’ (a) ‘ The weight of a table is 60 kg.’ Identify the mistake in the above sentence and then rephrase it. Explain why the sentence is wrong. …………..……………..……………..……………..……………..…………………….. ……………..……………..……………..……………..……………..………………….. ……………..……………..……………..……………..……………..………………. [1] (b) ‘…However, the mass of the table depends on where it is – high up in the mountains or at sea level.’ Identify the mistake in the above sentence and then rephrase it. Explain why the sentence is wrong. …………..……………..……………..……………..……………..…………………….. ……………..……………..……………..……………..……………..………………….. ……………..……………..……………..……………..……………..………………. [1]

Sec 2 LSS 3 Study nail A and nail B as shown below. The masses of both nails are the same. When the same force is applied to them, (a) Which nail can penetrate the wall easier? ………..……………..……………..……………..……………..……………………. [1] (b) Explain your answer. …………..……………..……………..……………..……………..…………………….. ……………..……………..……………..……………..……………..………………….. ……………..……………..……………..……………..……………..………………. [2] 4 The diagram bellows shows a box with a weight of 100 N. Calculate the maximum pressure that the box will exert on the ground. Pressure = ………………….. N/cm 2 [2]

Sec 2 LSS 5 The diagram below shows a man holding a carton walking in a horizontal direction. (a) Is there work done on the carton? …….………………………………………………………………………………….. [1] (b) Explain your answer. ……………..……………..……………..……………..……………..………………….. ……………..……………..……………..……………..……………..………………. [1] 6 Study the two figures given below. These figures show the important technologies in our surroundings. (a) State the sources of energy in each of technologies shown above. (i) Figure 6a: ………………………………………………………………………………….. [1] (ii) Figure 6b: ………………………………………………………………………………….. [1]

Sec 2 LSS (b) (i) What is the advantage of these two energy sources over the energy source of fossil fuels? ………………………………………………………………………………….. [1] (ii) List a negative impact on the environment when using the technology in Figure 6a . ………………………………………………………………………………….. [1] (c) State the principle energy transformation in both technologies. (i) Figure 6a: ………………………………………………………………………………….. [1] (ii) Figure 6b: ………………………………………………………………………………….. [1]

Sec 2 LSS Success Criteria (Pls tick accordingly) Section A Qn I can … 1 recognise that the interactions between two or more objects, result in a transfer of energy which can/may cause changes (by application of force) to the size and/or shape of an object ⬜ 2 compare weight and mass ⬜ 3 show an understanding that a force can be a contact force (e.g., friction) or non-contact force, (e.g., magnetic force, gravitational force) ⬜ 4 identify that work is done is an example of energy transfer that occurs when an object moves in the direction of a force ⬜ 5 identify that work is done is an example of energy transfer that occurs when an object moves in the direction of a force ⬜ 6 recognise that energy cannot be created nor destroyed, it is conserved when it is transferred (from one object to another) and/or converted (from one form to another) ⬜ Section B Qn I can … 1 recognise that the interactions between two or more objects, result in a transfer of energy which can/may cause changes (by application of force) to the ● state of rest or motion of an object ● turning effects in objects (e.g., spanners, levers to open tins) ● size and/or shape of an object ⬜ 2 compare weight and mass ⬜ 3 show an appreciation of some daily life phenomena associated with pressure (e.g., high-heeled shoes, cutting edge of a knife) ⬜ 4 investigate pressure using the formula, pressure = force/area ⬜ 5 identify that work is done is an example of energy transfer that occurs when an object moves in the direction of a force ⬜ 6 show an appreciation of the uses of various sources of energy (e.g., fossil fuels, solar, hydroelectric, wind energy, geothermal energy, biofuels and nuclear energy) and their impact on the environment ⬜

Sec 2 LSS