When we push on the brake pedal to slow down a car, a

Chapter , Problem 13

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When we push on the brake pedal to slow down a car, a brake pad is pressed against the rotor so that the friction of the pad slows the rotation of the rotor and thus the rotation of the wheel. However, the friction of the pad against the rotor cannot be the force that slows the car down because it is an internal forceboth the rotor and the wheel are parts of the car, so any forces between them are internal, not external forces. What external agent exerts the force that slows down the car? Give a detailed explanation of how this force operates.

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