Question

Any luggage kept on the roofs of cars or buses is always tied with a rope.Why?

Answer 1

Because when bus is in rest, the luggage that is kept on the roof of cars or buses are also is in rest. But when the car or bus comes to motion the luggage kept are also comes to motion but the luggage tend to remain at rest due to inertia of rest and hence disattached from the bus or car.That's why it is. adviced to keep the luggage on the roof of a bus or car is always tied with a rope.l