3. consider the forces acting on a car. when the car is accelerating, it will move in the direction of the net force. this is because the force of the engine is large enough to overcome the forces of friction and air resistance. however, objects do not always move in the direction of the net force. explain how this would be the case for a car coming to a stop at a traffic light. your answer should include a diagram showing the forces acting on the vehicle.

Acceleration is a rate at which velocity changes with time, in terms of both speed and direction. A point or an object moving in a straight line is accelerated if it speeds up or slows down.

According to the condition,

When the car is accelerating, it will move in the direction of the net force. this is because the force of the engine is large enough to overcome the forces of friction and air resistance.

However, objects do not always move in the direction of the net force.

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.

The force that accelerates the car is the static friction force. It is the only external force acting forward on the car and is therefore responsible for its acceleration per Newton's second law.

That force is the equal and opposite reaction to the force the wheel exerts backward on the ground per Newton's third law.

The below diagram shows the exact answer.

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