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noor arora Grade: 11
```        dear sir/madam
i am not able to understand projectiles. can u please give me the notes of projectiles in simple language . can you please send them in my email id? my email id is "noorarora14@yahoo.com".```
7 years ago

Answers : (1)

SAGAR SINGH - IIT DELHI
879 Points
```										DEAR NOOR,
Many  students have difficulty with the concept that the only  force acting upon an upward moving projectile is gravity.  Their conception of motion prompts them to think that if an  object is moving upward, then there must be an upward  force. And if an object is moving upward and rightward,  there must be both an upward and rightward force.  Their belief is that forces cause motion; and if there is an  upward motion then there must be an upward force. They  reason, "How in the world can an object be moving upward if  the only force acting upon it is gravity?" Such students do  not believe in Newtonian physics (or at least do not  believe strongly in Newtonian physics). Newton's laws  suggest that forces are only required to cause an  acceleration (not a motion).A force is not required to keep an object in motion. A force is only  required to maintain an acceleration. And in the case of a  projectile that is moving upward, there is a downward force  and a downward acceleration. That is, the object is moving  upward and slowing down.
To further ponder this  concept of the downward force and a downward acceleration  for a projectile, consider a cannonball shot horizontally  from a very high cliff at a high speed. And suppose for a  moment that the gravity switch could be turned  off such that the cannonball would travel in the absence  of gravity? What would the motion of such a cannonball be  like? How could its motion be described?This is what is projectile motion.

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Sagar Singh
B.Tech IIT Delhi

```
7 years ago
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