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MasteringPhysics_ KINEMATICS IN 3 DIM View

# MasteringPhysics_ KINEMATICS IN 3 DIM View -...

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MasteringPhysics: Assignment Print View http://session.masteringphysics.com/myct/assignmentPrint?assignm... 1 of 18 10/11/08 11:24 PM [ Print View ] Physics 2211-001, Fall 2008 Kinematics in 3 dim Due at 11:00pm on Friday, September 5, 2008 View Grading Details A Push or a Pull? Learning Goal: To understand the concept of force as a push or a pull and to become familiar with everyday forces. A force can be simply defined as a push or a pull exerted by one object upon another . Although such a definition may not sound too scientific, it does capture three essential properties of forces: Each force is created by some object. Each force acts upon some other object. The action of a force can be visualized as a push or a pull. Since each force is created by one object and acts upon another, forces must be described as interactions . The proper words describing the force interaction between objects A and B may be any of the following: "Object A acts upon object B with force ." "Object A exerts force upon object B." "Force is applied to object B by object A." "Force due to object A is acting upon object B." One of the biggest mistakes you may make is to think of a force as "something an object has ." In fact, at least two objects are always required for a force to exist. Each force has a direction: Forces are vectors. The main result of such interactions is that the objects involved change their velocities: Forces cause acceleration . However, in this problem, we will not concern ourselves with acceleration--not yet. Some common types of forces that you will be dealing with include the gravitational force (weight), the force of tension, the force of friction, and the normal force. It is sometimes convenient to classify forces as either contact forces between two objects that are touching or as long-range forces between two objects that are some distance apart. Contact forces include tension, friction, and the normal force. Long-range forces include gravity and electromagnetic forces. Note that such a distinction is useful but [ Print ]

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MasteringPhysics: Assignment Print View http://session.masteringphysics.com/myct/assignmentPrint?assignm... 2 of 18 10/11/08 11:24 PM not really fundamental: For instance, on a microscopic scale the force of friction is really an electromagnetic force. In this problem, you will identify the types of forces acting on objects in various situations. First, consider a book resting on a horizontal table. Part A Which object exerts a downward force on the book? ANSWER: the book itself the earth the surface of the table Part B The downward force acting on the book is __________. ANSWER: a contact force a long-range force Part C What is the downward force acting on the book called? ANSWER: tension normal force weight friction Part D Which object exerts an upward force on the book?
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