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vijay kumar pandey Grade: 12

when we throw a ball frm the ground,we say it is following projectile motion and in projectile motion we consider 0 accleration in the horizontal in this case how can we neglect the accleration in the horizontal direction,because if i am throwing the ball then i am applying some force and that force is impartting acclerationin in the slanting this accleration will definitely have horizontal how can we say that no accleration in the horizontal direction.

plsssssssssssssssssssss analyse the seachuation and make me clear.

7 years ago

Answers : (2)

AJIT AskiitiansExpert-IITD
68 Points
Dear   vijay kumar pandey,

When you throw a ball you definitely apply certain force as per FIRST LAW OF motion which says that it is essential to apply a force if you want a body to change its state of motion . so you apply the force .
but to solve the questions you need to consider only that part in which body is in air and then body has already slipped from the hands so no force is applied by the thrower WHILE IN AIR . only gravitational
force acts and we say to neglect other horizontal forces such as air drag . hope this clears the doubt..

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7 years ago
souvik das
33 Points

You are imparting a force at the time of projection which is accelerating the ball to a certain uniform velocity but there is no constant acc. provided by you through out the projectile motion which will provide a component of acc. in horizontal direction. The vertical negative acc. comes from gravity.  

7 years ago
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