6work_FA10 - Work Work In order to accomplish work on an object there must be a force exerted on the object and it must move in the direction of

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1 Work In order to accomplish work on an object there must be a force exerted on the object and it must move in the direction of the force. When a force does no work A force with no motion or a force perpendicular to the motion does no work 1 Work Work describes a transfer of energy Always talk about the work done on an object by a force work is a type of energy, so it has the same units (Joules, etc.) as kinetic energy Don’t confuse Work with Weight (both use symbol W ) For one dimensional motion, with a constant force F: Fd W = 2 Work done by force F on object = (Force)(displacement of object) Familiar example: A 300g cart is accelerated from rest by a 1.2 N force for a distance of 1.0 m. What is the work done by the force on the cart? 1.2 N 1 m 3 Work can be negative, if displacement is opposite the direction of the force: d F d F 0 > W 0 < W Kinetic energy = 1/2 (mass)(velocity) 2 Kinetic Energy Kinetic energy is energy of motion. The kinetic energy of an object
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This note was uploaded on 11/22/2010 for the course PHYS 1146 taught by Professor Balasubramamaheswaran during the Spring '10 term at Northeastern.

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6work_FA10 - Work Work In order to accomplish work on an object there must be a force exerted on the object and it must move in the direction of

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