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प्रश्न
Why does it happen?
If a stationary bus suddenly speeds up, passengers are thrown in the backward direction.
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उत्तर
If a stationary bus suddenly speeds up, passengers are thrown in the backward direction. This is because initially, the whole body of a passenger inside the bus was in the state of rest. But, when the bus suddenly starts or speeds up, the lower half of the passenger's body comes into motion in the forward direction, but the upper half still remains at rest due to the inertia of rest. Hence, the passengers are thrown backwards when a stationary bus suddenly speeds up.
संबंधित प्रश्न
Name the unbalanced force which slows down a moving bicycle when we stop pedalling it.
State whether the following statement is true or false :
Unbalanced forces acting on a body change its shape.
Fill in the following blanks with suitable word :
If there were no unbalanced force of……………….. and no…………………. resistance, a moving bicycle would go on moving for ever.
Give one example where a force moves a stationary body.
Give one example where a force changes the shape (and size) of a body.
Why are road accidents at high speeds very much worse than road accidents at low speeds ?
There are two types of forces X and Y. The forces belonging to type X can produce motion in a stationary object but cannot change the shape of the object. On the other hand, forces belonging to type Y cannot produce motion in a stationary object but can change the object. What is the general name of the forces as (a) X, and (b) Y?
When we talk of a force acting on a body, it usually means :
When a rubber balloon held between the hands is pressed, its shape changes. This happens because :
A fielder pulls his hands backwards after catching the cricket ball. This enables the fielder to :
