Advertisements
Advertisements
प्रश्न
Explain the following:
Why does dust fly off, when a carpet is hit with a stick?
उत्तर
Because of the sudden movement, the clothes moves, but dust on account of the inertia of rest is left behind.
APPEARS IN
संबंधित प्रश्न
Calculate the momentum of the following :
(a) an elephant of mass 2000 kg moving at 5 m/s
(b) a bullet of mass 0.02 kg moving at 400 m/s
On what factor does the inertia of a body depend ? Which has more inertia, a cricket ball or a rubber ball of the same size ?
If the mass of a body and the force acting on it are both doubled, what happens to the acceleration ?
Name the two kinds of inertia.
Why does a person fall when he jumps out from a moving train ?
Why does a coin, placed on a card, drop into the tumbler when the card is rapidly flicked with a finger?
Explain the following :
When a corridor train suddenly starts , the sliding doors of some compartments may open .
Explain the following:
Why do fruits fall off the branches in the strong wind?
Assertion & Reasoning
- Assertion: The value of ‘g’ decreases as height and depth increase from the surface of the Earth.
- Reason: ‘g’ depends on the mass of the object and the Earth.
Two blocks of masses 8 kg and 2 kg respectively lie on a smooth horizontal surface in contact with one other. They are pushed by a horizontally applied force of 15 N. Calculate the force exerted on the 2 kg mass.
