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  • 1. • What is motion ? • In what motion does the fan rotate? • Is motion studied as a different branch of physics? • Lets see it in the presentation…..
  • 2. Definition:- When a body is continuously changing its position with respect to the frame of reference , then we say that the body is in motion. What is motion?
  • 3. EXAMPLE : • An athlete running in a race continuously changes his position on the track with respect to the audience that watches him!
  • 4. EXAMPLE : • A car constantly changes its position with respect to the given path!
  • 5. EXAMPLE 2: The earth is continuously changing position with respect to sun which is at rest (sun is at rest with respect to our solar system!) .
  • 6. SCALARS AND VECTORS • The motion of objects can be described by words - words such as distance, displacement, speed, velocity, and acceleration. • These mathematical quantities which are used to describe the motion of objects can be divided into two categories. The quantity is either a vector or a scalar. These two categories can be distinguished from one another by their distinct definitions:
  • 7. What are the different types of motion? • Linear motion • Curvilinear motion (circular) 1. Rotatory motion 2. Revolution motion • Oscillatory motion • Reciprocatory motion (vibration) • Brownian motion
  • 8. Curvilinear Motion Brownian Motion Oscillatory Motion Vibratory Motion Linear Motion Motion
  • 9. Linear Motion When a body moves in a straight line then the linear motion is called or linear motion or rectilinear motion. • The motion of a particle (a point-like object) along the line can be described by its position x, which varies with t (time). Example :- An athlete running a 100 meter race along a straight track is said to be a linear motion or rectilinear motion.
  • 10. Linear Motion • It can be described mathematically using only one spatial dimension. • It can be uniform, that is, with constant velocity or non-uniform, that is, with a variable velocity. • The average velocity v during a finite time span of a particle undergoing linear motion is equal to :- V=  Δd/Δt
  • 11. Curvilinear Motion When a body moves along a curved path then the motion is called curvilinear motion. • There are two types of curvilinear motion:- 1. Rotatory Motion 2. Revolution Motion
  • 12. Rotatory Motion • Rotatory motion : A body is said to be in Rotatory motion when it stays at one place and turns round and round about an axis. Example : a rotating fan, a spinning top, the earth.
  • 13. Kinematics : It deals with the study of motion of bodies Without any reference to the cause of motion.
  • 14. Revolution Motion • Revolution:- When a body revolves around a body at some certain distance (radius) with a speed Ex: Earth revolving around Sun
  • 15. Oscillatory Motion • Oscillatory motion : A body is said to be in oscillatory motion when it swings to and fro about a mean position. example : the pendulum of a clock, the swing etc.,
  • 16. Physics Related To Motion • Mechanics : It is an important branch of physics and deals with the effect of force on bodies. • It is further divided into two parts:- 1.Dynamics 2.Kinematics
  • 17. Dynamics : In dynamics we discuss the motion of bodies under the action of forces.