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प्रश्न
Gravitational force is a ______ force.
उत्तर
Gravitational force is a non-contack force.
APPEARS IN
संबंधित प्रश्न
Make a match
| A group | B group |
| 1. Fluid | a. Higher pressure |
| 2. Blunt knife | b. Atmospheric pressure |
| 3. sharp needle | c. Specific gravity |
| 4. Relative density | d. Lower pressure |
| 5. Hecto pascal | e. Same pressure in all directions |
Explain giving two examples of following :
Non - contact forces
A spring is compressed against a rigid wall. Draw a neat and labeled diagram showing the forces acting on the spring.
State one factor on which the magnitude of a non-contact force depends. How does it depend on the factor stated by you?
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.
Explain the following:
Why do we jerk wet clothes before spreading them on a line?
Complete the analogy.
Kicking a ball: Contact force:: Falling of leaf: ______?
The force which acts on an object without physical contact. ______
Two thermocol balls held close to each other but move away from each other, when they are released. Name the force which might be responsible for this phenomenon. Explain.
