Final answer:
Avoid stopping or shifting gears while a car is accelerating or a person is standing up. For a smoother stop in a car, ease up on the brake pedal before halting to account for the shift from kinetic to static friction.
Step-by-step explanation:
You must avoid stopping or shifting gears while a car is accelerating or a person is standing up from a seated position. Both these actions, option C, contribute to the dynamics of motion and balance. When learning to drive, you'll find out that letting up slightly on the brake pedal before coming to a complete stop results in a smoother stop due to the transition from kinetic to static friction. This can be explained by the force exerted by friction when a car is in motion (kinetic friction) being slightly different than when it is stationary (static friction). When the vehicle slows down and is about to stop, easing off the brakes helps adjust to the stronger static friction without a jolt.