MP12- Newton's Laws

# MP12- Newton's Laws - MasteringPhysics: Assignment Print...

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3/2/08 4:51 PM MasteringPhysics: Assignment Print View Page 1 of 4 http://session.masteringphysics.com/myct/assignmentPrint?assignmentID=1114132 [ Print View ] PHYS 2211 ABCDE Spring 08 MP12: Newton's Laws Due at 11:59pm on Tuesday, January 29, 2008 View Grading Details Understanding Newton's Laws Part A An object cannot remain at rest unless which of the following holds? Hint A.1 How to approach the problem Hint not displayed Hint A.2 Newton's 1st law: a body at rest Hint not displayed ANSWER: The net force acting on it is zero. The net force acting on it is constant and nonzero. There are no forces at all acting on it. There is only one force acting on it. If there is a net force acting on a body, regardless of whether it is a constant force, the body accelerates. If the body is at rest and the net force acting on it is zero, then it will remain at rest. The net force could be zero either because there are no forces acting on the body at all or because several forces are acting on the body but they all cancel out. Part B If a block is moving to the left at a constant velocity, what can one conclude? Hint B.1 How to approach the problem Hint not displayed Hint B.2 Newton's 1st law: a body in motion Hint not displayed ANSWER: There is exactly one force applied to the block. The net force applied to the block is directed to the left. The net force applied to the block is zero. There must be no forces at all applied to the block. If there is a net force acting on a body, regardless of whether the body is already moving, the body accelerates. If a body is moving with constant velocity, then it is not accelerating and the net force acting on it is zero. The net force could be zero either because there are no forces acting on the body at all or because several forces are acting on the body but they all cancel out. Part C A block of mass is acted upon by two forces: (directed to the left) and (directed to the right). What can you say about the block's motion? Hint C.1 How to approach the problem Hint not displayed Hint C.2 Newton's 2nd law Hint not displayed Hint C.3 Relating acceleration to velocity Hint not displayed ANSWER: It must be moving to the left. It must be moving to the right. It must be at rest. It could be moving to the left, moving to the right, or be instantaneously at rest.

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## This note was uploaded on 05/08/2008 for the course PHYSICS 2211 taught by Professor Uzer during the Spring '08 term at Georgia Tech.

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MP12- Newton's Laws - MasteringPhysics: Assignment Print...

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