How Does Friction Both Propel and Slow Down a Car?

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Friction plays a crucial role in both propelling and slowing down a car. When a car accelerates, the engine generates power that is transferred to the wheels, creating friction between the tires and the road, which propels the vehicle forward. On slippery surfaces, such as ice, insufficient friction prevents effective acceleration, leading to loss of control. To slow down a car, brakes are applied, increasing friction between the brake pads and the wheels, which reduces speed. Understanding the dual role of friction is essential for safe driving and vehicle performance.
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Homework Statement


Describe how friction propels a car forward, then explain how friction slows a cars forward motion

anyone have any idea?
 
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How does the force get from the engine to the road?
What would happen if you tried to accelarate away on perfectly slippery ice?

What do you use to slow a car down?
 
Kindly see the attached pdf. My attempt to solve it, is in it. I'm wondering if my solution is right. My idea is this: At any point of time, the ball may be assumed to be at an incline which is at an angle of θ(kindly see both the pics in the pdf file). The value of θ will continuously change and so will the value of friction. I'm not able to figure out, why my solution is wrong, if it is wrong .
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