By John Keighley, Stephen Doyle (auth.)
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Extra resources for Physics GCSE
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When the weight and the air resistance are equal and opposite, the resultant force is zero. ] v AnswerC Example 5 The diagram shows the directions of three forces on a moving lorry. 0 Solution [Acceleration change in velocity time taken for change gradient of graph 4 m/s 2s 2 - - = 2m/s] AnswerB boo :&- - - - A i r resistance Example 4 Friction .. Forward thrust The lorry is travelling at constant speed. Which of these is correct? Air resistance A 2000N B 2000N C 3000N D 3000N Friction lOOON 2000N 3000N 4000N Forward thrust 3000N 5000N 3000N 6000N Solution [When a body is travelling at constant speed the net (resultant) force on it is zero.
A body is said to be in unstable equilibrium if when given a small displacement and then released it moves further from its original position. A body is said to be in neutral equilibrium if when given a small displacement and then released it stays in its new position. Referring to the illustration below, the equilibrium is stable in (a), unstable in (b) and neutral in (c). (a) (c) (b) (a) Stable equilibrium (b) Unstable equilibrium (c) Neutral equilibrium For a body in stable equilibrium, the stability is increased by having a large base area and/or a low centre of gravity.
Calculate the power output of the generator. (2 marks) If the wind speed doubles, what mass of air now passes in 1 second through the area swept out by the blades? (1 mark) If the wind speed doubles, how many times bigger will the power output of the generator be? (2 marks) The power output of a modem coal-fired power station may be 1000 MW (1 X 109 W). Use the figures in this question to discuss whether or not wind-powered generators are a practical alternative. ) electrical energy. The block diagram shows three parts of the system described above.