Chapter 03Kinematics of Linear Motion(Acceleration and Equations of Motion)Lec-12 Learning Objectives Review Velocity and Acceleration Review Problems 1st Equation of motion Home Task VelocityVelocity is displacement covered in any time ORVelocity is speed and direction. SI unit m/s(푽_풂풗 ) ⃗=푺 ⃗/풕 Types of Velocity1.Uniform Velocity. Displacement does not change with time.2. Variable VelocityDisplacement changes with time AccelerationChange in velocity of a body in some time is called Acceleration. SI unit m/s2 푽_풇−푽_풊=(∆푽) ⃗푪풉풂풏품풆 풊풏 풗풆풍풐풄풊풕풚 풊풏 풖풏풊풕 풕풊풎풆=(∆푽) ⃗/∆풕 풂 ⃗= (∆푽) ⃗/∆풕 AccelerationAcceleration can be positive and negative based on velocity.If the velocity of body is increasing, it will posses Acceleration.If the velocity of body is decreasing, it will undergo deceleration or retardation. Similar Problems. (Do it yourself)Example(P.38). A car is moving with uniform acceleration and attains the velocity of 72 Km11-1 in 5 min. Find acceleration of the car. Problem(3.2) A person hears the echo of his own sound from a distant hill after 2 seconds. How far away is the person from the hill, if the speed of sound is 330 ms-1Problem(3.3) Find the acceleration of a body whose velocity increases from 11ms-1 to 33 ms-1 in 10 seconds.Problem (3.3) A car moving with a velocity of 36 kmh-1 is brought to rest in 5 seconds; calculate its deceleration. Equations of Motion.First Equation of MotionSuppose a body is moving with initial velocity vi and.is under going uniform acceleration "a" for a time "t" such that its final velocity becomes vf.Change in velocity of the body in time t = vf - viTherefore change in velocity in unit time = "vf − vi" /푡As change in velocity in unit time (i.e. the rate of change velocity) is called acceleration. Equations of Motion.First Equation of MotionTherefore a= "vf − vi" /푡vf - vi = at∴ vf = vi - at ------ (1)This is called First Equation of Motion Home Task Write the Definitions of velocity, acceleration, their formula and probelems. Thank You For Your Cooperation You can find this presentation on Slideshare.com “Acceleration and Equation of Motion”