Before the collision, the car is in motion at a constant velocity. This means there is no net force acting on the car, and the car will continue moving at the same speed and direction.
Newton's First Law (Law of Inertia): An object at rest will stay at rest, and an object in motion will stay in motion with the same speed and in the same direction unless acted upon by an unbalanced force.
Newton's Second Law says that during the collision, the car experiences a sudden deceleration. This deceleration is caused by the unbalanced force exerted by the wall. The magnitude of the deceleration is proportional to the magnitude of the wall force and inversely proportional to the mass of the car.
Newton's Third Law explains that the car exerts a force on the wall, and the wall exerts an equal and opposite force on the car. This is the wall force that stops the car's motion.
complete question:
Brian crashes his car on to a wall. Consider frictional forces. Draw the Diagram of the forces acting on the car the instant it crashes. Use Newton's laws to explain the forces acting on the car before and during the collision.