# F06s(1) - Physics 204A SECOND EXAM Chapters 1 7 Spring 2006...

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Physics 204A SECOND EXAM Chapters 1 - 7 Spring 2006 1 Name:_________________________________________ Solve the following problems in the space provided. Use the back of the page if needed. Each problem is worth 20 points. You must show your work in a logical fashion starting with the correctly applied physical principles. The equations you need are on the equation sheet. Your score will be maximized if your work is easy to follow because partial credit will be awarded. 1. The man at the right pushes a 15.0kg wheelbarrow at a constant speed of 0.750m/s. The normal force that the ground exerts on the wheel is 80.0N and the frictional force that the ground exerts on the wheel is 25.0N. Find the magnitude and direction of the force exerted by the man on the wheelbarrow. Since the velocity is constant the acceleration is zero. Applying Newton’s Second Law, " r F = m r a # " F x = ma x # F m cos \$ % F fr = 0 " F y = ma y # F m sin + F n % F g = 0 & ( Using the mass/weight rule and solving for the force exerted by the man, F m cos " = F fr = 25.0 N F m sin = F g # F n = mg # F n = (15.0)(9.80) # 80 = 67.0 N

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F06s(1) - Physics 204A SECOND EXAM Chapters 1 7 Spring 2006...

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