Advertisements
Advertisements
Question
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.
Solution
- The velocity of the football changes when the first player kicks the ball towards another player on his team.
- The velocity of the football changes when another player kicks it towards the goal.
- The velocity of the football changes as the opposing team's goalkeeper collects it.
- The velocity of the football changes when the goalkeeper kicks it towards a teammate.
Thus, the velocity of the ball changes four times in this case.
In the first and second examples, the players' feet provide force. In the third situation, the goalkeeper's hands deliver force. In the fourth example, the goalkeeper's foot provides force as he smashes the football with his foot.
APPEARS IN
RELATED QUESTIONS
What will be the momentum of a body of mass ‘m’ which is moving with a velocity V ?
With which physical quantity should the speed of a running bull be multiplied so as to obtain its momentum ?
What is meant by the term inertia?
Name the factor on which the inertia of a body depends and state how does it depend on the factor stated by you .
Give two examples to show that greater the mass, greater is the inertia of the body.
Why does a person fall when he jumps out from a moving train ?
Explain the following :
When a corridor train suddenly starts , the sliding doors of some compartments may open .
Define force.
Explain the following:
Why do fruits fall off the branches in the strong wind?
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.
