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Difference between G (Gravitational constant), and g (Acceleration due to gravity), , , , , , , , Gravitation Gravitational, Constant (G) acceleration (g), Its value is 6.67x10™ Its value is 9.8, "Nm2/kg?. m/s2., Its value remains Its value varies at, , constant always and _ | various places., everywhere., , , , Its unit is Nm?2/kg?. Its unit is m/s2., , , , Itis a scalar quantity. | Itis a vector, quantity.
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Equation of motion when an object is falling, freely towards earth or thrown vertically, upwards, , Case 1: When an object is falling towards, earth with initial velocity (u), , Velocity (v) after t seconds, v =u + ght, , Height covered in t seconds, h = ut + “gt?, Relation between v and u when tis not given:, , v2 =u2+2gh
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Case 2: When object is falling from rest, position means initial velocity u=0, , Velocity (v) after t seconds, v = gt, , Height covered in t seconds, h = gt?, Relation between v and u when tis not given:, , v2 =2gh
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Case 3: When an object is thrown vertically, upwards with initial velocity u, the, gravitational acceleration will be negative (, g), , Velocity (v) after t seconds, v=u- gt, Height covered in t seconds, h = ut - %gt?, Relation between v and u when t is gven: v2 =, , u2-2gh
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Mass, , ~ The mass of a body is the quantity of matter, contained in it. Mass is a scalar quantity which, has only magnitude but no direction., , ~ Sl unit of mass is kilogram which is written in, short form as kg., , * Mass of a body is constant and does not, change from place to place., , « Mass of a body is usually denoted by the, small ‘m’., , * Mass of a body cannot be zero.
