Serway_PSE_quick_ch05

Serway_PSE_quick_ch05 - Physics for Scientists and...

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Unformatted text preview: Physics for Scientists and Engineers, 6e Chapter 5 – The Laws of Motion Which of the following statements is most correct? 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. It is possible to have forces on an object in the absence of motion of the object. 2. It is possible to have forces on an object in the absence of motion of the object. 3. Neither (a) nor (b) is correct. 4. Both (a) and (b) are correct. Choice (1) is true. Newton’s first law tells us that motion requires no force: an object in motion continues to move at constant velocity in the absence of external forces. Choice (2) is also true. A stationary object can have several forces acting on it, but if the vector sum of all these external forces is zero, there is no net force and the object remains stationary. An object experiences no acceleration. Which of the following cannot be true for the object? 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. A single force acts on the object. 2. No forces act on the object. 3. Forces act on the object, but the forces cancel. If a single force acts, this force constitutes the net force and there is an acceleration according to Newton’s second law. An object experiences a net force and exhibits an acceleration in response. Which of the following statements is always true? 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. The object moves in the direction of the force. 2. The acceleration is in the same direction as the velocity. 3. The acceleration is in the same direction as the force. 4. The velocity of the object increases. Newton’s second law relates only the force and the acceleration. Direction of motion is part of an object’s velocity , and force determines the direction of acceleration, not that of velocity. You push an object, initially at rest, across a frictionless floor with a constant force for a time interval Δ t , resulting in a final speed of v for the object. You repeat the experiment, but with a force that is twice as large. the experiment, but with a force that is twice as large....
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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_ch05 - Physics for Scientists and...

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