Police investigator observes a skid marks 25m long left by a 1500kg car. The car skidded to stop on a concrete highway having a coefficient of kinetic friction with the tires of 0.80. Estimate the car's speed at the beginning of the skid?

Police investigator observes a skid marks 25m long left by a 1500kg car. The car skidded to stop on a concrete highway having a coefficient of kinetic friction with the tires of 0.80. Estimate the car's speed at the beginning of the skid?

University Physics Volume 1

18th Edition

ISBN:9781938168277

Author:William Moebs, Samuel J. Ling, Jeff Sanny

Publisher:William Moebs, Samuel J. Ling, Jeff Sanny

Chapter8: Potential Energy And Conservation Of Energy

Section: Chapter Questions

Problem 60P: A 60.0-kg skier with an initial speed of 12.0 m/s coasts up a 2.50-m high rise as shown. Find her...

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Static and Kinetic Friction

Kinetic friction comes into existence when there are moving surfaces means in other words we can say that the force which comes into existing between moving surfaces is known as kinetic friction.

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You are driving your car on a straight road with a coefficient of friction between the tires and the road of 0.55. A large piece of debris falls in front of your view and you immediate slam on the brakes, leaving a skid mark of 30.5 m (100-feet) long before coming to a stop. A policeman sees your car stopped on the road, looks at the skid mark, and gives you a ticket for traveling over the 13.4 m/s (30 mph) speed limit. Should you fight the speeding ticket in court?
A 60.0-kg skier with an initial speed of 12.0 m/s coasts up a 2.50-m high rise as shown. Find her final speed at the top, given that the coefficient of friction between her skis and the snow is 0.80.
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Check Your Understanding Can kinetic friction ever be a constant force for all paths?
A driver of a 1000 kg car traveling at 20 m/s slams on the brakes and skids to a stop. If the coefficient of friction between the tires and the horizontal road is 0.80, how long will the skid marks be?
A skier is on a 25° slope and his mass is 80kg. If his constant velocity and the coefficient of kinetic friction between the ski and the snow is 9 m/s and 0.80, respectively, compute his velocity when he has skid 20m from his initial position and a drag force experienced by the skier equivalent to a magnitude of 0.6V^2.
At an accident scene on a level road, investigators measure a car’s skid mark to be 112 m long. It was a rainy day and the coefficient of friction was estimated to be 0.42. Use these data to determine the speed of the car when the driver slammed on (and locked) the brakes.
A skier is on a 25 degree slope and his mass is 80kg. If his constant velocity and the coefficient of kinetic friction between the ski and the snow is 9 m/s and 0.80, respectively, compute his velocity when he has skid 20m from his initial position and a drag force experienced by the skier equivalent to a magnitude of 0.6V^2.
At an accident scene on a level road, investigators determine that a car slid for a distance 72 m before coming to a stop. It was a rainy day and the coefficient of friction was estimated to be 0.36. - What was the speed of the car when the driver slammed on the brakes? - Why does the car's mass not matter?
A skier on a 25° slope and his mass is 80 kg. If his constant velocity and thecoefficient of kinetic friction between the ski and the snow is 9m/sand 0.80, respectively, compute his velocity when he has skid 20m from his initialposition and a drag force experienced by the skier equivalent to a magnitude of 0.6V^2.