Advertisements
Advertisements
प्रश्न
Explain the following:
Why is it difficult to walk on marshy ground?
उत्तर
It becomes difficult to walk on marshy ground because when we push the marshy ground with our feet, the ground yields. So it does not react back with the same force.
APPEARS IN
संबंधित प्रश्न
In the following example, try to identify the number of times the velocity of the ball changes:
“A football player kicks a football to another player of his team who kicks the football towards the goal. The goalkeeper of the opposite team collects the football and kicks it towards a player of his own team”.
Also identify the agent supplying the force in each case.
What will be the momentum of a body of mass ‘m’ which is moving with a velocity V ?
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
Describe the term ‘inertia’ with respect to motion.
Why do the passengers in a bus tend to fall backward when it starts suddenly ?
A water tanker filled up to `2/3` of its tank with water is running at a uniform speed. When the brakes are suddenly applied, the water in its tank would
Dust particles are removed from a carpet by beating it.
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.
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)
