explain the role of inertia in the following situations?

Question

*the slow acceleration of a large truck compared to that of a car.
*a car that still moves for a short period even after the brakes have been applied.
*a passenger standing in a fully loaded bus which is at rest tends to move backward when the driver suddenly starts the bus

Answer 1

a=f/m
*The more the mass the greater the force required to achieve the same aceleration.
*The brakes are not an infinite force, so instantaneous stop is not possible.
*The bus passenger stayed in the same place while the bus began moving, until he or she was pushed along by another passenger.

Answer 2

Since the mass of the truck is much more than that of the car, for a givcen torque or even for a bit more, the acceleration of the truck will be slow compared to a car. The example of a small gunboat and a large tanker will be much more apt. The larger mass will have higher inertia.

After the brakes are applied, the car moves a little distance forward because of the inertia.

A passenger standing in a bus will tend to move backwards when the driver starts the bus suddenly and similarly will tend to move forward when brakes are applied suddenly.