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Extra info for Cambridge IGCSE Physics, 3rd edition
With a dense piece of metal the resistance is negligible at low speeds. 2). And we are told that, to the surprise of onlookers who expected the cannonball to arrive first, they reached the ground almost simultaneously. You will learn more about air resistance in Chapter 8. 1 A coin and a piece of paper fall at the same rate in a vacuum. e. e. a = −g = –10 m/s2). 3 and investigate the motion of a 100 g mass falling from a height of about 2 m. Construct a tape chart using one-tick lengths. Choose as dot ‘0’ the first one you can distinguish clearly.
The weight of a body is the force of gravity on it. 2 The weight of an average-sized apple is about 1 newton. 8 N. indd 24 20/06/14 7:38 AM Hooke’s law Often this is taken as 10 N. A mass of 2 kg has a weight of 20 N, and so on. The mass of a body is the same wherever it is and, unlike weight, does not depend on the presence of the Earth. 3. Read the scale opposite the bottom of the hanger. Add 100 g loads one at a time (thereby increasing the stretching force by steps of 1 N) and take the readings after each one.
7). Questions 1 A stone falls from rest from the top of a high tower. Ignore air resistance and take g = 10 m/s2. a What is its velocity after (i) 1 s, (ii) 2 s, (iii) 3 s, (iv) 5 s? b How far has it fallen after (i) 1 s, (ii) 2 s, (iii) 3 s, (iv) 5 s? 2 An object falls from a hovering helicopter and hits the ground at a speed of 30 m/s. How long does it take the object to reach the ground and how far does it fall? Sketch a velocity–time graph for the object (ignore air resistance). Checklist After studying this chapter you should be able to • describe the behaviour of falling objects, • state that the acceleration of free fall for a body near the Earth is constant.