# Motion of freely falling bodies and projectile motion

Jun 17th, 2015
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Vertical Free Fall of the Bodies and Air Resistance• When an object falls towards earth under gravity in absence of air resistance, it is called a freely falling body.• Air resistance affects motion of a falling body and depends on its shape, size and speed.

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PhysicsLight reflection and refraction ch 10 10th bookOptics: defects of vision ch Human Eye and Colourful World and RAY OPTICS AND OPTICAL INSTRUMENTS 12thElectromagnetic waves ch 8 12th physicsSound chapter 12 9th bookMotion of freely falling bodies and projectile motionVertical Free Fall of the Bodies and Air ResistanceAll objects in free fall experience same accelerationWhenan object falls towards earth under gravity in absenceWhen there is no air, the acceleration of an objectofairresistance,it is called a freely falling body.under free fall is independent of its massWhen we let a coin and feather fall in an airless tube, Air resistance affects motion of a falling body and dependson its shape, size and speed.both reach the bottom at same time.Terminal VelocityWhen a body falls, it accelerates due to gravity and retarding force of air resistance increases with speed. This continues tillforce of air resistance equals weight of object. Now object no longer accelerates but falls with a constant speed calledterminal velocity. TV is about 200 km/hr for a skydiver with an unopened parachute. While falling, skydivers use a "spreadeagle" position to increase the air resistance and prolong time of fall.Projectile motionAny object which follows a path determined by the gravitational force and air resistance when an initial velocity is given, iscalled a projectile. A bullet shot from a rifle, a rocket after its fuel is exhausted,

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