Physics II workshop_Part_15

# Physics II workshop_Part_15 - II Acceleration for car...

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32 II Acceleration for car moving at constant speed around the oval. A car is driving around the oval at a constant speed. Two locations, C and D are shown, D at a short time later than C. Make a large drawing of this on another piece of paper. Draw and label velocity vectors, r v C , r v D for the car at points C and D. A. Draw a vector diagram showing the vector change in velocity, Δ r v = r v D r v C . 1. Draw the initial velocity r v C and the change in velocity, Δ r v with their tails together and show the angle between the two vectors. Show the same angle on the previous diagram. Is the angle between velocity and the change in velocity less than, equal to, or greater than 90°? 2. If the time interval is smaller, point D is closer to point C. Will the angle in part 1 change? If so will it be closer to or farther from 90°? 3. What is the limiting value for this angle as the time interval approaches zero? (Remember that the speed is constant.) Can you prove this result? 4. For the case of constant speed, how are the directions of

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Physics II workshop_Part_15 - II Acceleration for car...

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