Force and Acceleration Test Review

# A person pushes a 20 kg crate with a constant force

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A person pushes a 20 kg crate with a constant force of 600 N at an angle of 20° below the horizontal. The crate starts from rest and after 5 s, is traveling at 4 m/s. What is the coefficient of kinetic friction between the crate and the surface? 1.37 9) Below are three different masses each of which has a coefficient of kinetic friction of 0.15 between the surface and the masses. The masses are connected by ropes. The mass on the right is being pulled with a force of 300 N. a) What is the acceleration of the system? 9.64 m/s 2 b) What is the net force acting on each mass? 48.2N, 115.68N, 96.4N c) What is the force of Rope 1 on mass 1? 55.55N d) What is the force of Rope 1 on mass 2? 55.55N e) What is the force of Rope 2 on mass 2? 188.87N f) What is the force of Rope 2 on mass 3? 188.87N 10) A car traveling at 25m/s slams on the brakes and skids for 12m on a drive patch of concrete where the coefficient of kinetic friction is 0.8. The road ends and it skids on wet grass until it comes to a stop. The coefficient of kinetic friction between the wet grass and the tires is 0.3. What is the total distance the car skids? 86.29m 11) A 5 kg mass is supported by two cables, as seen below. What is the tension in each of the ropes? 23N, 42.98N 300 N Mass 1 Mass 2 Mass 3 5 kg 12 kg 10 kg Rope 1 Rope 2 Rope 1
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