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Forums
Engineering
Mechanical Engineering
Help with a car under braking and friction force
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[QUOTE="jack action, post: 6068785, member: 240508"] You are right, the direction of acceleration ##a## is opposite to the direction of motion when in deceleration. What is missing from your force diagram is the inertia, i.e. ##ma##. The inertia is always opposite the direction of the acceleration ##a##. Since the sum of the forces in the x-direction (horizontal) must be equal to ##ma## and the only force acting on the car is the braking (friction) force, then it must be equal and opposite to the inertia ##ma##. The question doesn't mention the driving force coming from the engine and is irrelevant to find the answer of this particular problem. [/QUOTE]
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Forums
Engineering
Mechanical Engineering
Help with a car under braking and friction force
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