Question

1. Does the force from the ground or the force from the engine accelerate a car and why?
2. To keep a car moving without slipping, friction between the tires and ground is essential. Is that friction kinetic or static and Why?

Answer 1

Solution:

1.)

Ans:Force from ground.

Reason: To accelerate something, there needs to be a force from the outside. For the car accelerating from rest, the only thing acting on it in the forward direction is the friction due to the ground. This seems backwards.

2.)

Ans: Static friction,

Reason:

For the front wheels to roll without slipping, the friction must be static.If we turn on friction to the front wheels only, the car accelerates forward with the back wheels dragging along the road without spinning. Friction opposes this motion, so it must point opposite to the way the car is going. Again, it must be static friction.

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