P112_HW6_S06

# P112_HW6_S06 - constant force of 5 N The block starts off...

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Physics 112 Homework #6 Spring 2006 Read: Chap. 6, intro. + sections 6.1, 6.2 Chap. 7, intro. + section 7.1 For discussion: Chap. 6: Qs #Q6.2, Q6.3, Q6.4, Q6.7, Q6.10, Q6.11, Q6.12, Q6.13 (not turned in) Chap. 7: Qs #Q7.2, Q7.4; Due Monday, Mar. 6 at lecture: #6.4 [Sliding Crate] #6.9 [Ball on String] #6.24 [Watermelon Work] Please add: (c) What is the watermelon's speed just before it hits the ground according to work-energy considerations? #6.25 [Little Red Wagon] #7.5 [Baseball Energetics]

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1. A hand pushes a 3 kg block along a table from point A to point C as shown in the figure below. The table has been prepared so that the left half of the table (from A to B) is frictionless. The right half (from B to C) has a non-zero coefficient of friction equal to m. The hand pushes the block from A to C using a
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Unformatted text preview: constant force of 5 N. The block starts off at rest at point A and comes to a stop when it reaches point C. The distance from A to B is 0.5 meter and the distance from B to C is also 0.5 meter. Point P is half way between B and C. a. Describe in words the motion of the block as it moves from A to C. b. Draw a free-body diagram for the block when it is at point P. c. What is the direction of the acceleration of the block at point P? If it is 0, state that explicitly. Explain your reasoning. d. Does the magnitude of the acceleration increase, decrease, or remain the same as the block moves from B to C? Explain your reasoning. e. What is the net work done on the object as it moves from A to B? From B to C? f. Calculate the coefficient of kinetic friction μ ....
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P112_HW6_S06 - constant force of 5 N The block starts off...

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