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प्रश्न
A gas filled balloon moves up. Is the upward force acting on it larger or smaller than the force of gravity?
उत्तर
The upward force will be greater than the force of gravity.
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संबंधित प्रश्न
Explain giving two examples of following :
Contact forces
Classify the following amongst contact and non - contact forces:
Frictional force
Normal reaction force
Force of tension in a string
Gravitational force
Electrostatic force
Magnetic force
Give one example in each of the following cases where a force:
(i) Stops a moving body.
(ii) Moves a stationary body.
(iii) Changes the size of a body.
(iv) Changes the shape of a body.
A ball moving on a table top eventually stops. Explain the reason .
Two equal and opposite forces act on a stationary body. Will the body move? Give a reason to your answer.
A car initially at rest, picks up a velocity of 72 kmh−1 in 20 seconds. If the mass of the car is 1000 kg, find
- Force developed by its engine
- Distance covered by the car.
A cricket player holds a cricket ball of mass 100 g by moving his hands backward by 0.75 m. If the initial velocity of the ball is 108 kmh−1, find the retarding force applied by the player.
Fruits detached from a tree fall down due to the force of gravity. We. know, that a force arises due to the interaction between two objects. Name the objects interacting in this case.
A man is pushing a cart down a slope. Suddenly the cart starts moving faster and he wants to sloyy it down. What should he do?
Figure shows a car sticking to an electromagnet. Name the forces acting on the car. Which one of them is larger?
