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Question
What do you understand by the term inertia?
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Solution
“Inertia is the property of a body due to which it cannot change its state (rest or of uniform motion) itself.” Until some external force is applied to it.“
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RELATED QUESTIONS
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.
Fill in the following blank with suitable word :
(a) ………………is a measure of the inertia of a body.
A body of mass 25 kg has a momentum of 125 kg.m/s. Calculate the velocity of the body.
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 ?
What is meant by the term inertia?
Give two examples to show that greater the mass, greater is the inertia of the body.
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.
What are the types of inertia? Give an example for each type.
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)
