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123_lab7_wke - Physics 123 Minilab 7 WORK AND KINETIC...

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Physics 123 - Minilab 7 WORK AND KINETIC ENERGY Introduction Work is done by a force acting over a distance. According to the work-kinetic energy theorem, the kinetic energy K of an object will change by the amount of work W done on the object. With a constant force F acting parallel to a displacement d, we have: K = W = Fd. (1) We will measure the change in kinetic energy of a cart rolling down an inclined track. The force due to gravity on the cart along the direction of motion depends on the mass of the cart and the angle θ of the track to the horizontal: F 1 = F g sin θ = mg sin θ . (2) Of course, the cart’s wheels are not free of friction, and if we assume that the frictional force f k is constant, then the total force acting on the cart is F = F 1 – f k (3) and thus K = (F 1 – f k )d. (4) Procedure 1. Set the track at an angle of about 5 degrees using the wood. Determine this angle by measuring the elevation h of the track at two positions x; record these data on the next page. Calculate the angle and record it, along with the mass of
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