Unit 4 Practice Problems

# Unit 4 Practice Problems - Physics Honors Worksheet...

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Physics Honors Worksheet: Chapters 9 and 16 A 3.5-m long diving board has a mass of 30 kg. It is connected to two pylon supports, as shown in the diagram at right. 1) Relative to pylon B, what torque is applied by the weight of the diving board? = 191 N·m [into the page] 2) What force must pylon A exert on the diving board to keep it in equilibrium? F = 174 N [D] 3) What force must pylon B exert on the diving board to keep it in equilibrium? F = 468 N [U] A uniform plank, with length L and mass m , rests on the ground and against a frictionless roller at the top of a wall of height h = ½ L . The angle between the plank and the horizontal is . Friction acts on the bottom of the plank. 4) Show that the force the roller applies to the plank is given by cos sin F mg 5) When L = 6 m and m = 40 kg, the bottom of the plank will slip if is less than 60º. What is the coefficient of static friction? s = 0.479 A pole is held up in the position shown at right by friction at its bottom and by the tension in a horizontal wire connected to its top. A block is suspended from the pole a distance x from the top of the pole. 6) What normal force acts on the bottom of the pole? 2107 N 7) If x = 2.50, what is the friction force acting on the pole?

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