Observe and explain why the movement of a bicycle, motorcycle, or other vehicle does

Observe and explain why the movement of a bicycle, motorcycle, or other vehicle does not immediately stop when the engine is turned off.

When the vehicle is moving, the phenomenon of inertia is observed. Inertia is the property of a body to keep its state constant. Before the engine was switched off, the transport body was moving. Now that the engine is no longer running, the body tends to maintain its state of motion. It takes strength and time to change the state of movement. This force is the friction force.
Mass acts as a measure of the inertia of bodies; the greater the mass of the body, the more difficult it is to change its state.