When you press braking pedal -- wheel road surface tangent F

In summary, the conversation discusses deceleration while driving a car and the role of the tangent force on the road surface. It is proposed that as long as the wheels do not slide, the tangent force is not relevant. The request is made to not consider detailed contact mechanics and to draw a free body diagram to determine if a car can move without a tangent force on frictionless wheels.
  • #1
Gunmo
11
1
- You are driving car with 100 mile/hour

- You are pressing brake pedal.

- The speed of car is suddenly gone down. Decelerated.

- However, Wheel is rolling on road without sliding and car stopped smoothly finally.In this case,

- the tangent force acting on road surface is related with deceleration rate dv/dt ?

- or as long as there is no sliding of wheel, tangent force is not relevant.

- Please do not count detailed contact mechanic.
 

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  • #2
Can you draw a free body diagram of the situation? Could a car ever move (on level ground) if no tangent force could act? ie if the wheels were frictionless?
 

FAQ: When you press braking pedal -- wheel road surface tangent F

1. What happens when you press the braking pedal?

When you press the braking pedal, it initiates a series of actions that result in your vehicle slowing down or coming to a complete stop. This is achieved through a complex system involving the brake pedal, brake pads, rotors, calipers, and brake fluid.

2. How does pressing the braking pedal affect the wheels?

Pressing the braking pedal causes the brake pads to clamp down on the rotors, creating friction and slowing down the rotation of the wheels. This allows the wheels to come to a stop or slow down depending on the amount of pressure applied to the pedal.

3. What is the significance of the wheel road surface tangent F in relation to pressing the braking pedal?

The wheel road surface tangent F refers to the point where the tire meets the road surface. When the brake pedal is pressed, the friction between the brake pads and rotors creates a force that acts on this point, causing the wheels to slow down or stop.

4. How does the condition of the road surface affect the effectiveness of pressing the braking pedal?

The condition of the road surface can greatly affect the effectiveness of pressing the braking pedal. On a wet or slippery surface, it may take longer for the wheels to come to a stop due to reduced friction. Additionally, a rough or uneven road surface can also impact the braking performance of a vehicle.

5. What are the potential hazards of pressing the braking pedal too hard?

Pressing the braking pedal too hard can cause the wheels to lock up, resulting in loss of control of the vehicle. It can also cause excessive wear on the brake components, potentially leading to brake failure. It is important to apply the right amount of pressure to the pedal to ensure safe and effective braking.

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