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QuestionPhysics

Disc brakes work by: A. Stopping the drive axle. B. Pressing outward from a disc, to stop a drum from rotating. C. Stopping a disc inside the transmission. D. Pressing inward, on a disc, to stop it from turning.
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Answer

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Step 1:
Let me solve this systematically:

Step 2:
: Understand Disc Brake Mechanics

Disc brakes are a critical component in vehicle braking systems, designed to slow or stop wheel rotation by applying friction.

Step 3:
: Analyze the Mechanism

In a typical disc brake system: - A brake disc (rotor) is attached to the wheel - Brake pads are positioned on either side of this disc - When the brake pedal is pressed, brake calipers squeeze these pads - The pads press inward against the spinning disc - This friction creates resistance that slows or stops the wheel's rotation

Step 4:
: Evaluate the Answer Choices

A. Stopping the drive axle - Incorrect B. Pressing outward from a disc - Incorrect C. Stopping a disc inside the transmission - Incorrect D. Pressing inward, on a disc, to stop it from turning - CORRECT

Step 5:
: Detailed Explanation

The key mechanism is that brake pads press INWARD on the disc (rotor) to create friction and stop the disc's rotation, which in turn stops the wheel.

Final Answer

Pressing inward, on a disc, to stop it from turning.