# Ch5 HW2 - WebAssign Ch5 HW2(Homework Current Score 20 out...

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Ch5 HW2 (Homework) Arthur Barfield PHYS 2211, section M, Fall 2008 Instructor: Jennifer Curtis Web Assign Current Score: 20 out of 20 Due: Wednesday, October 1, 2008 09:00 AM EDT Description Work and change in particle energy Instructions Reading: Sections 5.3-5.4 The due date for this assignment is past. Your work can be viewed below, but no changes can be made. 1. [MI2 05.X.12.01] 4/4 points An object which is originally at location < -12 , 0, 0 > m moves to location < -17 , 0, 0> m as shown in the diagram above. While it is moving it is acted on by a constant force of < -26 , 0, 0 > N. How much work is done on the object by this force? W = 130 130 J As a result, the kinetic energy of the object increases increases A different object moves from location < -17 , 0, 0 > m to location < -12 , 0, 0 > m, as shown above. While it is moving it is acted on by a constant force of < -26 , 0, 0 > N. How much work is done on the second object by this force? W = -130 -130 J

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As a result, the kinetic energy of the object decreases decreases Solution or Explanation If the work done on a particle is negative, the kinetic energy of the particle decreases; if the work done is positive, the kinetic energy of the particle increases.
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