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COMBINED SCIENCE
MACHINES
PHYSICS TEST
Time: 2 hours
- Answer all questions
- Neatness and clear presentation answers is a must.
- You may use a calculator
- Clearly write your equations
- A graph paper is provided for questions involving graphs
- Underline all calculations
- Presentation of work must be sequential
- The number of marks awarded for each question are shown at the end of each question
QUESTION MARK
TOTAL
- The diagram shows a trolley of weight 10N being pulled at a stead speed from the bottom of a plank by a force of 2N. (a) Name the type of machine shown …………………………………………………………………………………… ………………………………………………………………………...………. [1] (b) Calculate the MA of the machine ……………………………………………………………………………………… ……………………………………………………………………………………… ……………………………………………………………………………………… ……………………………………………………………………………………… …………………………………………………………………………………...[3]
(b) State Distance moved by effort. ……………………………………………………………………………………… ……………………………………………………………………………………… Distance moved by load. ……………………………………………………………………………………… …………………………………………………………………………………...[2]
- (a) A pulley system of VR 3 is used to raise a load. Draw a diagram of the pulley system in the space below. [3]
(b) If the pulley system is used to raise 200N using an effort of 85N, calculate, (i) the M.A (mechanical advantage) ………………………………………………………………………………… ………………………………………………………………………………… ………………………………………………………………………………… ………………………………………………………………………………… ………………………………………………………………………………… ………………………………………………………………………………… ………………………………………………………………………………..[3] (ii) the EFF ( efficiency) of the pulley system ………………………………………………………………………………… ………………………………………………………………………………… ………………………………………………………………………………… ………………………………………………………………………………… ………………………………………………………………………………… ………………………………………………………………………………… ………………………………………………………………………………..[3] (c) Suggest two ways of improving the efficiency of the pulley system ……………………………………………………………………………… ………………………………………………………………………………
(a) What effect would increasing the length of the handle have on [6] (i) The M.A of the pump. …………………………………………………………………………………………… …………………………………………………………………………………………… …………………………………………………………………………………………… (ii) The V.R of the pump. …………………………………………………………………………………………… …………………………………………………………………………………………… …………………………………………………………………………………………… (b) What would be the advantage of having most of the pump parts made of plastic instead of iron? [2] ……………………………………………………………………………………… ………………………………………………………………………………………
- The diagram shows a pair of pliers with short handles cutting a wire.
(a) (i) State the effects of increasing the handles ……………………………………………………………………………………… ……………………………………………………………………………………… ……………………………………………………………………………………… ……………………………………………………………………………………… ……………………………………………………………………………………… ………………………………………………………………………………….. [2] (ii) Explain how the efficiency would be affected by oiling the pivot. ………………………………………………………………………………………… ………………………………………………………………………………………… ………………………………………………………………………………………… ……………………………………………………………………………………..[2]
- (a) The diagram shows a typical gear system of a bicycle. The load of the bicycle and the cyclist is 1000 N and the effort applied by the cyclist on the gear is 500N. (a) Calculate the mechanical advantage (MA) of the gear system [ 3 ] ………………………………………………………………………………………… ………………………………………………………………………………………… ………………………………………………………………………………………… ………………………………………………………………………………………… (b) Calculate the velocity ratio (VR) of the gear system [2] ……………………………………………………………………………………… ……………………………………………………………………………………… ……………………………………………………………………………………… Load gear 30 teeth Effort gear 10 teeth 10 teeth
(c) Calculate the efficiency of the gear system [2] ………………………………………………………………………………… ………………………………………………………………………………… ………………………………………………………………………………… …………………………………………………………………………………
- If, in testing the mechanical advantage of this system, the following results were obtained, answer the questions that follow: Load (N) 20 80 140 220 300 Effort (N) 11 25 42 60 80 (a) Calculate the mechanical advantage (MA) of the machine in each case. [5] ………………………………………………………………………………………… ………………………………………………………………………………………… ………………………………………………………………………………………… ………………………………………………………………………………………… ………………………………………………………………………………………… ………………………………………………………………………………………… …………………………………………………………………………………………
