Sir!escape velocity waly topic mn body out of gravitational field ja rahi ha tu wahan tu P.E zero ho jaye ge na.matlb p.e decrese kr jae ge.tu work positive nai ho ga?
work is done against the gravity as the object is moved against the gravitional force of attraction yaani gravititional force opposite direction mei hy aur work done ho rha hy in the opposite direction so it should be negative jab body force ki direction ko follow karay gi tab positive hogi..🚶♂
Q. In a collision where work done is due to external force, what can be said about the total mechanical energy of system. Ans. Total mechanical energy may or may not change . Please explain it sir. Kindly sir g
well idk if this is gonna make sense but imagine the surface is not frictionless, and someone is pushing one of the balls during the collision This push is an external force doing work on the system If the person pushes the ball, they are adding energy to the system, increasing the total mechanical energy. on the other hand , if friction slows down the balls, it is removing energy from the system, decreasing the total mechanical energy so the work done may be positive in the case of pushing and negative in the case of frictional force so therefore the total energy may change. - In the case where it doesnt change is that of elastic collision when there is no friction so the total k.e before would be the same as after so total energy would remain the same. hope this makes sense XD.
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Thankyou so much sir your lecture helped me alot i was so confused but thanks to you i am cleared with formulas know😊😊😊😊
Sir...jitnaa bie duwaa doo...shehiad kamm..❤❤
Also formula of increase in momentum when increase in kinetic energy is given
❤❤❤❤❤ May Allah bless you sir g ❤❤❤
watching first time this chapter a week before mdcat. I hope to secure enough for mbbs
😂😂😂
Sir. J. All. Short. Lecture. Cover. Kare❤❤❤
Jazakallah sir ❤
100 % clear ❤
Ustad ne saare students ke physics kandhe per uthai hui hai❤
Aoa ; sir Bio mn inheritance chapter ki video post krde apki bio bi bht best smjh ati humy 😭apky reply ka wait rahe ga ❤
Thanks sir ❤❤❤
Kinetic energy and momentum increase or decrease formula's were not discussed
Escape velocity pmdc k syllabus mai included hai..???
Plz also tell formulas for increase in kinetic energy when increase in momentum is given
Here's a shortcut
2(% inc/Dec in momentum) ± n²
If momentum increasing : n = +
Otherwise -
n = % inc/Dec in momentum / 10
W.salam
Sur!please upload all
Hi everyone
❤❤❤❤
Sir!escape velocity waly topic mn body out of gravitational field ja rahi ha tu wahan tu P.E zero ho jaye ge na.matlb p.e decrese kr jae ge.tu work positive nai ho ga?
work is done against the gravity as the object is moved against the gravitional force of attraction yaani gravititional force opposite direction mei hy aur work done ho rha hy in the opposite direction so it should be negative jab body force ki direction ko follow karay gi tab positive hogi..🚶♂
sir mdcat playlist ma lastl lectures complete available ha
Q. In a collision where work done is due to external force, what can be said about the total mechanical energy of system. Ans. Total mechanical energy may or may not change . Please explain it sir. Kindly sir g
well idk if this is gonna make sense but imagine the surface is not frictionless, and someone is pushing one of the balls during the collision This push is an external force doing work on the system If the person pushes the ball, they are adding energy to the system, increasing the total mechanical energy. on the other hand , if friction slows down the balls, it is removing energy from the system, decreasing the total mechanical energy so the work done may be positive in the case of pushing and negative in the case of frictional force so therefore the total energy may change.
- In the case where it doesnt change is that of elastic collision when there is no friction so the total k.e before would be the same as after so total energy would remain the same.
hope this makes sense XD.
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