PROJECTILE MOTION : Class 11 Physics

This topic of 'Projectile Motion' is in 'Chapter 4 : Motion in a Plane' of the NCERT Physics book of class 11. It is an important chapter for #NEET, #JEE and class 11 Board Exams. This topic will enhance your thinking and analytical capabilities by introducing you to a new way of studying physical phenomena; that of splitting a single motion into a combination of two independent motions in two different directions. Don't worry if you found the last sentence confusing, you will understand it as we proceed. It was Galileo who first stated this independency in 1632.

My Teaching Approach

I will teach you projectile motion in a simple-to-understand method and will focus on the key points you need to understand and memorize. I will use your existing knowledge of 'Newton's laws of motion', 'vectors' and 'motion in one dimension'  to teach you this new concept. You will find it easy if you follow my approach to learn it.

So, let's start.

Question: What is a Projectile?

Answer: An object that is in flight after being thrown or projected is called a projectile.

Question: What is Projectile Motion?

Answer: When only the force of gravity acts on a body after it is projected (or thrown), then the motion of the body is called a Projectile Motion.

Note that from the above definition it clear that the following falls under projectile motion. The motion of

  • stone thrown by a boy
  • ball thrown by a cricket player
  • shell fired by a canon
  • a food packet released from an aircraft flying overhead
  • and such other motions.

But the following do not fall under projectile motion:

  • motion of a aircraft (it gets a force from its engine also)
  • motion of a rocket (it gets force from the burning fuel)
  • and such other motions where another force, in addition to the force of gravity, acts on the object.

Now watch the following video on Projectile Motion:

The video explains projectile motion thoroughly. The video includes the derivations of the required formulas of Projectile Motion. The video also highlights the important points you need to understand and memorize about Projectile Motion.


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