Sports and Second Law of Motion
Sports and Second Law of Motion
Sports and Second Law of Motion
1. A cricket player or fielder moves his hands backward while catching a fast cricket ball. This allows the fielder to catch the ball by applying a small force on it. If you keep your arms still while catching, the fielder has to apply a larger force on the ball. When we pull arms back with the ball. We apply a smaller force for a longer time. This is because the ball stops completely only when the hands stops moving.
Explanation: Suppose the ball is moving with a speed u. When it stops completely, its speed is v = 0.Suppose ,in the first case, when you pull your arms back, it takes time to stop the ball. The acceleration of the ball in this period is
Similarly, if the time taken to stop the ball is in the second case,
The force in the two cases are
and
As is much larger than
, that force
is much larger than
. A cricket coach, therefore , advise you to pull back your arms while taking a catch, as this would be easier.
2. When an athlete jumps from a height on a hard surface, he can hurt his feet.
Explanation:
This is because the feet come to rest in a very short time and hence the force exerted on the feet is high. That is why athletes during high jump land on sand or foams. This increases the time in which the body comes to rest. The sand gives way allowing the body to slow down gradually.
A passenger in a moving train tosses a coin which falls behind him. Observing this statement what can you say about the motion of the train ? | |||
| Right Option : A | |||
| View Explanation | |||
A long jumper runs before jumping to take long jump because __________________ | |||
| Right Option : D | |||
| View Explanation | |||
The unit of measuring the momentum of a moving body is ______ | |||
| Right Option : C | |||
| View Explanation | |||
Students / Parents Reviews [10]
My experience with Abhyas is very good. I have learnt many things here like vedic maths and reasoning also. Teachers here first take our doubts and then there are assignments to verify our weak points.
Shivam Rana
7thAbout Abhyas metholodology the teachers are very nice and hardworking toward students.The Centre Head Mrs Anu Sethi is also a brilliant teacher.Abhyas has taught me how to overcome problems and has always taken my doubts and suppoeted me.
Shreya Shrivastava
8thMy experience was very good with Abhyas academy. I am studying here from 6th class and I am satisfied by its results in my life. I improved a lot here ahead of school syllabus.
Ayan Ghosh
8thMy experience with Abhyas academy is very good. I did not think that my every subject coming here will be so strong. The main thing is that the online tests had made me learn here more things.
Hiya Gupta
8thA marvelous experience with Abhyas. I am glad to share that my ward has achieved more than enough at the Ambala ABHYAS centre. Years have passed on and more and more he has gained. May the centre flourish and develop day by day by the grace of God.
Archit Segal
7thBeing a parent, I saw my daughter improvement in her studies by seeing a good result in all day to day compititive exam TMO, NSO, IEO etc and as well as studies. I have got a fruitful result from my daughter.
Prisha Gupta
8thIt has a great methodology. Students here can get analysis to their test quickly.We can learn easily through PPTs and the testing methods are good. We know that where we have to practice
Barkha Arora
10thAbhyas Methodology is very good. It is based on according to student and each child manages accordingly to its properly. Methodology has improved the abilities of students to shine them in future.
Manish Kumar
10thOne of the best institutes to develope a child interest in studies.Provides SST and English knowledge also unlike other institutes. Teachers are co operative and friendly online tests andPPT develope practical knowledge also.
Aman Kumar Shrivastava
10thAbhyas is a complete education Institute. Here extreme care is taken by teacher with the help of regular exam. Extra classes also conducted by the institute, if the student is weak.
