6.8. A driver sees a horse on the road and applies the brakes so hard that they lock and the car skids to a stop in 24 m. The road is level, and the coefficient of kinetic friction between tires and road is 0.7. How fast was the car going when the brakes were applied?

6.8. A driver sees a horse on the road and applies the brakes so hard that they lock and the car skids to a stop in 24 m. The road is level, and the coefficient of kinetic friction between tires and road is 0.7. How fast was the car going when the brakes were applied?

International Edition---engineering Mechanics: Statics, 4th Edition

4th Edition

ISBN:9781305501607

Author:Andrew Pytel And Jaan Kiusalaas

Publisher:Andrew Pytel And Jaan Kiusalaas

Chapter7: Dry Friction

Section: Chapter Questions

Problem 7.78P: The figure shows a steel bar being processed by a rolling mill. Given that P=80kN and r =0.016,...

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Concept explainers

Forming and Shaping

Metal forming is a category of metalworking process through which the material can be given the desired shape and size by subjecting it to plastic deformation, where the component undergoes bulk deformation process upon application of loads. Unlike the shearing and machining process, the material does not undergo up to a failure point as indicated in the stress-strain curve. Hence, the stresses induced during the forming process are greater than yield strength but less than the failure strength of the material. The process does not lead to the loss of material, so it can be said to be an economical process. During forming, the material is subjected to tensile forces, compressive forces, bending, and shearing loading conditions. The material should possess the property of ductility to undergo the forming process.

Question

6.8. A driver sees a horse on the road and applies the brakes so hard that they lock and the car skids to a stop in 24 m. The
road is level, and the coefficient of kinetic friction between tires and road is 0.7. How fast was the car going when the
brakes were applied?

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