HW-_Friction_1-D_HW_HONORS

# 85 what will be the total distance traveled from

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0.85, what will be the total distance traveled from moment seeing the light turn red to the time the car stops? 114.02 m 1) A 95 kg mass initially at rest. It requires a force of 650 N to get the mass moving and then a force of 560 N to keep it moving at a constant speed. What are μ s and μ k ? 0.7, 0.6 2) A 4000kg car starting from rest has a horizontal force of 32,000N acting on it. After driving for 5 seconds the car’s driver hits the brake. The car stops over a distance of 10 m. What is the coefficient of friction between the tires and the road? 8.16 not a realistic answer!!! 3) A 150kg object is sitting in the flat bed of a truck. The coefficient of static friction between the object and the truck is 0.56. The coefficient of kinetic friction is 0.4. What is the maximum acceleration of the truck before the block slides off the back? 5.49 m/s 2 4) A car is traveling at a constant rate of 30 m/s when the driver notices a light turn red ahead. It takes the driver 2 s to hit the breaks. If the coefficient of kinetic friction between the car’s tires and the road is 0.85, what will be the total distance traveled from moment seeing the light turn red to the time the car stops? 114.02 m
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• Fall '11
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