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Introduction to Kinematics (in Hindi)
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Introduction to position vector, distance, displacement with a problem.

## Udit Gupta is teaching live on Unacademy Plus

Udit Gupta
A Mechanical Engineer from NIT Allahabad here to help learners with physics. Also a Star ⭐ educator.

Thnk u sir...
Udit Gupta
a month ago
Happy to help!
Sir is this sufficient for neet ?
Udit Gupta
3 months ago
moztly
Sir could you please help me with this question... a stone of projected from a horizontal plane.it attains maximum height H and strikes a smooth wall and falls on the ground vertically below the maximum height. assuming the Collison to be elastic find the height in terms of H where the ball strikes on the wall
Udit Gupta
6 months ago
i am unable confuse to the question ask you not know reply what
Hello Sir I am preparing for NEET 2019. SO will your lectures be enough or it is more for me.... and if you can suggest me some good tutor for physics neet... thank you
Udit Gupta
9 months ago
only refer to the topics relevant to neet, else you will get all the help required.
okay sir thank you
sir please make a course on mcqs also and imp numericals of this chapter
1. Motion in 1D - 1 Compiled by: Udit Gupta Alumnus MNNIT Allahabad Ex-Manager at Reliance Industries Limited Ex-VidyaMandir Faculty of Physics Cofounder and HOD Physics Elements Azamgarh

2. Content Introduction Position Displacement . Distance Problems on displacement and distance

3. Introduction . This is the topic where we start mechanics In vectors we learnt how to deal with those quantities and now we will see their application. Mechanics is broadly divided in two topics namely kinematics and dynamics. In kinematics we deal with the motion of the particle (position, displacement, velocity and acceleration) not concerned with the factors producing that motion.

4. Position It refers to the location of a particle in space at a certain moment of time. Generally, this position is measured by a vector called position vector r) which is a line joining origin (fixed point) to the position of the particle.

5. Displacement . It is a vector joining initial position to the final position of a particle during a certain interval of time. We can simply say that the change in position of a moving particle is its displacement (s)

6. Distance It is the length of the actual path traversed by a particle. We can simply call it the length of path travelled by the particle. It is generally denoted by s or x.

7. Problem 1 An old person moves on a semi-circular track of radius 40.0m during a morning walk. If he starts at one end of the track and reaches at the other end, find the distance covered and the displacement of the person.

8. Problem 1 . Distance = length of track = x 40.0m = 126m . Displacement-diameter of the semi-circular track = 2r = 80m 40m

9. Problem- 2 A table clock has its seconds hand 4.0 cm long. Find the displacement and the distance of the tip of the seconds hand: (a) 30 seconds apart (b) 150 seconds apart.

10. Problem- 2 (a) In 30 seconds, the tip of seconds hand moves diametrically to the opposite side. Displacement = 8.0 cm Distance = (4) = 4 cm (b) In 150 seconds, the displacement is still the same but distance increases. Distance = 2(2 (4)) + (4) = 20