Ch 2 Phy Class 9

Important Easy Notes of Ch 2 Phy Class 9 English Medium written by Professor Mr. Samiullah Suib. These notes are very helpful in the preparation of Physics for students of the 9th class Physics English Medium and these are according to the paper patterns of all KPK Book Boards.

Summary and Contents:
Topics which are discussed in the notes are given below:
  • Definition of mechanics and also write the branches of mechanics.
  • Definition of kinematics and dynamics.
  • Definition of rest and motion with examples.
  • State and explain motion and relative
  • Types of motion: (1) Translatory motion (2) Rotatory motion (3) Vibratory motion.
  • Definition of Translatory motion with examples.
  • Types of translatory motion.
  • (i) Rectilinear motion with examples and (ii) curvilinear motion with examples.
  • Random motion with examples.
  • Definition of Rotatory motion with examples.
  • Definition of Vibratory motion with examples.
  • Definition of scalar with examples.
  • Definition of vector with examples.
  • Representation of vectors and symbolic representation of vectors.
  • Definition of graphical representation also explanation
  • Definition of co-ordinate system also purpose and types.
  • Step to represent a vector in a co-ordinate system.
  • A student travelled 100 m from the school towards the east graphically it be represented as.
  • Definition of distance with its notation, Unit ,Quantity.
  • Definition of displacement with its notation and unit.
  • Differentiate between distance and displacement.
  • Definition of speed with its symbol, mathematical form, unit ,nature.
  • Types of speed: average speed, instantaneous speed, uniform speed, variable speed.
  • Definition of average speed with its symbol and mathematical form, unit, quality, nature.
  • Definition of instantaneous speed with its symbol and mathematical form, unit, quality, nature.
  • Definition of uniform speed with its symbol and mathematical form, unit, quality, nature.
  • Definition of variable speed with its symbol and mathematical form, unit, quality, nature.
  • Definition of velocity: symbol, mathematical form, unit, quantity, nature, purpose.
  • Types of velocity: average velocity, instantaneous velocity, uniform velocity, variable velocity.
  • Definition of average velocity with its symbol and mathematical form, unit, quality, nature.
  • Definition of instantaneous velocity with its symbol and mathematical form, unit, quality, nature.
  • Definition of uniform velocity with its symbol and mathematical form, unit, quality, nature.
  • Definition of variable velocity with its symbol and mathematical form, unit, quality, nature.
  • Definition of acceleration: symbol, mathematical form, unit, equality, nature.
  • Definition types of acceleration: average acceleration, instantaneous acceleration, positive acceleration, negative acceleration, and Uniform acceleration.
  • Definition of average acceleration: symbol, mathematical form, unit, quantity, nature.
  • Definition of instantaneous acceleration: symbol, mathematical form, unit, quantity, nature.
  • Definition of positive acceleration: symbol, mathematical form, unit, quantity, nature.
  • Definition of negative acceleration: symbol, mathematical form, unit, quantity, nature.
  • Definition of Uniform acceleration: symbol, mathematical form, unit, quantity, nature.
  • Definition of variables also write Independent and dependent variables.
  • Definition of slope of graph and also calculation of slope of graph.
  • Definition of distance - time graph also purpose explanation with examples.
  • Show that slope or gradient of speed time graph gives us magnitude of acceleration.
  • Derive First equation of motion.
  • Derive second equation of motion
  • Derive third equation of motion.
  • Is it possible that displacement is zero but not the distance. Under what condition displacement will be equal to distance.
  • Does a speedometer is measure a car's a speed or velocity?
  • Is it possible for an object to be accelerating at rest at the same time? Explain with example.
  • Can an object have zero acceleration and non zero velocity at the same time? give example.
  • A person standing on the roof of a building and throws a rubber ball down with a velocity of 0.8m/s. What is the acceleration (the magnitude and direction) of the ball?
  • Describe a situation in which the speed of an object is constant while the velocity is not?
  • Can an object have a North velocity and a southward acceleration? explain.
  • As a freely falling objects speed up what happening to its acceleration. Does it increases, decrease or say the same?
  • A ball is thrown upward with initial speed of 5 m/s. What will be its speed when it returns to starting point?
  • Solved Numerical of the exercise Ch 2 Phy Class 9.
  • A squash ball makes contact with a squash request and change velocity from 15m/s west to east is in 0.10s. Determine the velocity acceleration of the Squash ball.
  • A golf ball that is initially travelling at 25m/s hits sand trap and slows down with acceleration of -20 m/s^2. Find its displacement after 2.0 s.
  • A bullet accelerates the length of the barrel of a gun 0.75 m long with a magnitude of 5.35*10^5 m/s^2. With what speed does the bullet exit the barrel.
  • A driver is travelling at 18 m/s when she sees a red light ahead. Her car is capable of decelerating at a rate of 3.65m/s^2. If she applies brakes when she is only 20.0m from the intersection when she sees the light, will she be able to stop in time.
  • An antelope moving with constant acceleration 2m/s^2 covers the crosses the point where its velocity is 5m/s.  After 6.00 s how much distance if it has covered and what is its velocity.
  • With what speed must a ball be thrown vertically from ground level to rise to a maximum height of 50 m?



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