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P4 Explaining Motion

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Equations you need

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THRUST WEIGHT AIR RESISTANCE Forces on the rocket at T=0 seconds

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Draw force diagrams for the rocket at T=5s and T=10s THRUST WEIGHT AIR RESISTANCE

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Video of a launch http://www.cbsnews.com/video/watch/?id=4 173117n http://www.cbsnews.com/video/watch/?id=4 173117n (please note there is a short delay before the video plays)

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Height

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TO think about What is the height of the rocket after.. a)5s b) 15s c)25s d) What would happen to the height at 45secs?

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Thrust

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Explain how the thrust changes with time. Explain why the rocket doesn’t need more fuel?

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Air Resistance

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How long does it take for air resistance to become zero? Explain why air resistance gets less as the time from launch increases.

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Calculations What is the GPE at the maximum height the rocket reaches assuming no weight loss from burning the fuel GPE = mgh = 90N x 3750 = 337500j (3375Kj) (remember weight in Newtons is a force which is mass x gravity) Assuming no air resistance as the rocket returns to Earth calculate the velocity of the rocket from this height KE =GPE = 1/2mv 2 = 33750Kj = ½ x 0.9Kg x v 2 v 2 = 33750Kj / 0.45 = 750000 V= √750000 = 866m/s

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