Advertisements
Advertisements
Question
Explain the following :
It is advantageous to run before taking a long jump .
Advertisements
Solution
When running, the athlete brings his body in the state of motion. When the body is in motion, it becomes easier to take a long jump.
APPEARS IN
RELATED QUESTIONS
What name is given to the product of mass and velocity of a body ?
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 ?
The inertia of an object tends to cause an object :
Explain the following :
When a corridor train suddenly starts , the sliding doors of some compartments may open .
What do you understand by the term inertia?
Explain the following:
Why does a pillion rider fall forward, when the driver of a two-wheeler suddenly applies the brakes?
Explain the following:
Why is it difficult to walk on marshy ground?
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.
A heavy truck and bike are moving with the same kinetic energy. If the mass of the truck is four times that of the bike, then calculate the ratio of their momenta. (Ratio of momenta = 2:1)
