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Key Points #3 & Problems on Graph (In Hindi)
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Through this lesson we'll cover some important portion of kinematics and dynamics in short and also we'll discuss a lot questions related to each topic.

Kumar Ketan is teaching live on Unacademy Plus

U
plz add all the remaining topics ...
Ayush P Gupta
a year ago
Okay sure.
Gaurav Ranjan
a year ago
Hi ayush .. thnx for the response.Plz make videos on diffraction as well..ur Content is gr8..i m liking it...
Ayush P Gupta
a year ago
I am glad that you like it. I will complete YDSE but will not be uploading Diffraction as i havent studied it properly.
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3. CRAs4 Physics course for IIT JEE Kinematics & Dynamics 1D Non-Accelerated Motion 1D Accelerated Motion Force Frictional Force Newton's Law of Motion Relative Motion

4. Points to Remember 'Displacement of a particle gives no information regarding the nature of the path followed by the particle. Motion with uniform velocity is on a straight line path. AT

5. For one dimensional motion the angle betweern a and v is either 0 or 180 . And it does not change with time. . For two dimensional motion, the angle between a and v is other than 0 or 180 . Also it may change with time

6. .If the angle between a and v is 0 or 180 the path of the particle is a straight line. .If the angle between a and v is other than 0 or 180 , the path of the particle is a curve. . If the angle between a and v is 90%, the path of the particle is a circle.

7. . For motion with constant acceleration the graph between x and t is a parabola. e In the above case the graph between v and t is a straight line. . Also in the above case, the graph between v and x is a parabola.

8. Which of the following time displacement graph is not possible in nature?

9. In graph (A), the velocity is infinite , which is practically impossible

10. Which of the following graphs represents the uniform motion ?

11. The distance time graph for uniform motion is a straight line inclined to both the time and distance axes

12. Which of the following distance time graphs represents one dimentional uniform motion?

13. ACCELERATED MOTION In non-uniform motion of an object, the velocity of the object is different at different instants, i.e., the velocity of the object keeps on changing with time. Such a motion is said to be an accelerated motion. For example, a vehicle while going from one position to another on a road, moves with different velocities at different instants, hence, it is the illustration of accelerated motion.

14. Acceleration is a vector quantity. It is positive if the velocity is increasing and is negative if the velocity is decreasing. The negative acceleration is also called a retardation or deceleration The unit of acceleration is in ms 2 in-mks system or SI and cms2 in CGS system. The dimensional formula acceleration is [M LT]

15. (c) Average acceleration- When an object is moving with a variable acceleration, then the average acceleration of the object for the givern motion is defined as the ratio of the total change in velocity of the object during motion to the total time taken, i.e.,

16. (d) Instantaneous acceleration when an object is moving with variable acceleration,men the object possesses different accelerations at different instants. The acceleration of the object at a given instant of time or at a given point of motion, is called its instantaneous acceleration.

17. Thus, the instantaneous acceleration of an object (1) is equal to the first time derivative of velocity at the given instant or (2) is equal to the second time derivative of position of the object at the given instant.