F08_lec05

# F08_lec05 - Lecture 5 P1112 Agenda for today A few practice...

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Lecture 5, P1112 Agenda for today • A few practice examples on velocity, acceleration and position • Relative Motion

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A quick problem: Airtrack with spring: start it by compressing the spring with cart. Take direction the cart is moving in as positive and bottom of the spring as the origin Draw the v versus t graph!
Cart with spring Which letter occurs when cart is – At highest point? – In contact with the spring? – Moving toward the spring? – Has zero acceleration?

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Cart with spring Which letter occurs when cart is – At highest point? B – In contact with the spring? D – Moving toward the spring? C – Has zero acceleration? Nowhere Draw acceleration and position
Cart with spring X(t) t a(t) t

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A rocket burns fuel to accelerate from rest. The burn lasts 10 seconds, during which the acceleration [in the vertical direction] has the form: a(t)= 100 m/s 2 -10 m/s 3 t 2. How fast is the rocket going in the end of the burn? 1. Draw (and label) a graph of a(t) 3. How high does the rocket go?
A rocket burns fuel to accelerate from rest. The burn lasts 10 seconds, during which the acceleration [in the vertical direction] has the form: a(t)= 100 m/s 2 -10 m/s 3 t 1. Draw (and label) a graph of a(t) 10s a(t) t 100m/s 2

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2. How fast is the rocket going in the end of the burn? 3. How high does the rocket go?
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F08_lec05 - Lecture 5 P1112 Agenda for today A few practice...

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