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PHY 121 Ch 4b Lecture

# PHY 121 Ch 4b Lecture - Lecture 5 Thursday January 31 1 In...

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1 Lecture 5 Thursday, January 31

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2 In calculating for applying Newton’s second law to an object A. One must add all forces exerted by the object. B. One must add all forces exerted on the object. C. One must add all forces exerted by the object plus all forces exerted on the object. D. One must add all forces exerted on the object and subtract all forces exerted by the object. ! F !
3 A free-body diagram A. Is a diagram showing an object free of interactions. B. Is a motion diagram for an object under the influence of a force. C. Is a diagram showing the target object and the forces acting upon it. D. Is not discussed in the reading assignment.

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4 The quantity in Newton’s second law applied to an object of mass m . A. is the force of the acceleration. B. must be added to all other forces acting on the object. C. is zero if the object is at rest. D. is not a force acting on the object. m ! a
5 The buoyancy force that keeps a swimmer from sinking is a member of an action-reaction pair. The other member is A. The weight of the swimmer. B. The forward thrust force. C. The downward force that the swimmer exerts on the water. D. the backward drag force.

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6 Free-body diagrams I A boy is pulling on a cart carrying a stack of books. The cart is moving at constant velocity. Construct a motion diagram and a free-body diagram for the top book.
7 Construct the motion diagram !

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