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Free Fall #2 (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

Kumar Ketan
#Specialisation in Electronics #6 years teaching experience #Physics Faculty in Kota #"magical education" (211k+ subs) #Writer

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mam I am beginners and from civil branch I don't know syllabus yet plz help me out
sir nth second wale formula mai t kya hai??
last question mein we use formula n TH second lekin Yahan Par t n TH wala Anna Jayenge Lekin total time please explain
hello explain sign conservation of G H t
1. ne

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. FREE FALL A body falling under the action of gravity is known as freely falling body. The motion is known as free fall. Let us consider a body at height H. Two cases arise. (1) Body is dropped (u-0) (2) Body is thrown with some initial velocity

5. (a) When body is dropped u-0, a g then (1) v gt (2) v 2gh Ar

6. Surface

7. (b) When body is thrown downwards with some initial velocity Let the initial velocity be u, a - g, then (2)v2 - u2 +2gH (3)s - ut h gt2

8. Maximum height attained When the body will attain maximum height the velocity of the body will be zero. That is v-0, a g, s-H Using v2 -u2 2as, we get

9. Time of Flight (a)Time taken for upward motion Using v - u + at, we get Or t=u/g

10. (b) Time taken for downward motion Using v - u gt, we find Or u gt or t-u/g u.2)

11. From (1) and (2), we can conclude that Time of ascent = Time of descent Therefore, time of flight = 2u/g

12. A body is thrown with the speed of 12 m/s vertically upward from the ground. What will the vertical distance in last 0.4 sec before reaching 1.2 sec maximum hight? (a) 0.6 m (b) 0.8 m (c) 0.4 m (d) 0.2 m

13. We take u at 0.8 sec h=ut + gt2 = 4 x 0.4- 10 (0.4)2 1.6-5 (0.16) = 1.6-0.8 = 0.8 m

14. x=5 distance = 7x = 7 5 = 35

15. 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

16. .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.

17. . 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.

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

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