Serway_PSE_quick_ch04

Serway_PSE_quick_ch0 - Physics for Scientists and Engineers 6e Chapter 4 – Motion in Two Dimensions Which of the following cannot possibly be

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Unformatted text preview: Physics for Scientists and Engineers, 6e Chapter 4 – Motion in Two Dimensions Which of the following cannot possibly be accelerating? 1 2 3 33% 33% 33% 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 1. An object moving with a constant speed 2. An object moving with a constant velocity 3. An object moving along a curve An object moving with constant velocity has Δ v = 0, so, according to the definition of acceleration, a = Δ v /Δ t = 0. Choice (1) is not correct because a particle can move at a constant speed and change direction. This possibility also makes (3) an incorrect choice. Consider the following controls in an automobile: gas pedal, brake, steering wheel. The controls in this list that cause an acceleration of the car are 1 2 3 4 25% 25% 25% 25% 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 1. all three controls 2. the gas pedal and the brake 3. only the brake 4. only the gas pedal Because acceleration occurs whenever the velocity changes in any way – with an increase or decrease in speed, a change in direction, or both – all three controls are accelerators. The gas pedal causes the car to speed up; the brake pedal causes the car to slow down. The steering wheel changes the direction of the velocity vector. Suppose you are running at constant velocity and you wish to throw a ball such that you will catch it as it comes back down. In what direction should you throw the ball relative to you?...
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This note was uploaded on 01/19/2010 for the course PHYS 200 taught by Professor Davies during the Spring '08 term at Roger Williams.

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Serway_PSE_quick_ch0 - Physics for Scientists and Engineers 6e Chapter 4 – Motion in Two Dimensions Which of the following cannot possibly be

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