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प्रश्न
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Can you give example for contact and non-contact forces?
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उत्तर
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संबंधित प्रश्न
Give one example in the case where the force is of contact.
Give one example in the given cases:-
A force moves a stationary body
Give one example in the given cases:-
A force changes the shape of a body
Which of the following is not the force at a distance:
(a) electrostatic force
(b) gravitational force
(c) frictional force.
(d) magnetic force.
Two balls of masses in ratio 1 : 2 are dropped from the same height find
a) the ratio between their velocities when they strike the ground and
b) the ration if the forces acting on them during motion.
How much acceleration will be produced in a body of mass 10 kg acted upon by a force of 2 kgf?(g = 9.8 ms-2)
A uniform car of mass 500g travels with a uniform velocity of 25 ms-1 for 5 s. The brakes are then applied and the car is uniformly retarded and comes to rest in further 10 s calculate
1) the retardation
2) the distance which the car travels after the brakes are applied
3) The force exerted by the brakes.
When an elevator starts to move down suddenly we experience 'weightlessness'. Explain.
Moon or Cloud?
Observe the moon on a windy night with a fair bit of cloud cover in the sky. As the cloud passes in front of the moon you sometimes think it is the moon which is moving behind the cloud. What would you think if you were to observe a tree at the same time?
The trees are greenish. They are greenish at the tip too. How does the water rise upward in a tree or plant against the force of gravity?
