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3) Free fall :, The earth attracts objects towards it due to gravitational force. When an, object falls towards the earth due to the earth’s gravitational force it is called, free fall., , When an object falls towards the earth there is a change in its acceleration, due to the gravitational force of the earth. So this acceleration is called, acceleration due to gravity., , The acceleration due to gravity is denoted by g., The unit of g is same as the unit of acceleration ms, From the second law of motion, force is the product of mass and acceleration., F=ma, For free fall, force is the product of mass and acceleration due to gravity., Mxm M, or g=G---- where Mis the mass of the, ae &, , where Mis the mass of the earth and d is the distance between the object and, the earth., , For objects near or on the surface of the earth dis equal to the radius of the, earth FR, , F=mg or mg=G, , , , Mxm M, , mg = G -------= - of g= G--- The value of gis 9.8ms?, R R?, , Scanned with CamScanner

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4a) Mass :, The mass of a body is the measure of its inertia. If the mass of a, body is more its inertia is more., , The mass of a body is constant and does not change from place to, place., , The SI unit of mass is kg., , b) Weight :The weight of a body is the force with which the earth attracts the, body., , The force with which a body is attracted by the earth depends on its, mass mand acceleration due to gravity g., , F=mxg, , Since weight of a body is the force with which the earth attracts the, body, W=mxg, , Since g at a place is constant, Wa m, The weight of a body changes from place to place., The SI unit of weight is the same as force — Newton (N)., , Scanned with CamScanner

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c) Weight of an object on the moon :, The weight of an object on the earth is the force with which the earth, attracts the object and the weight of an object on the moon is the force, with which the moon attracts the object., , The mass of the moon is less than the mass of the earth. So the, moon exerts lesser force on the objects than the earth., , The weight of an object on the moon is one sixth (1/6") of its weight, on the earth., , Celestial Mass (kg) Radius (m), body, , Earth 5.98x104 6.37 x 108, , Moon 7.36x10? 1.74x 105, , , , Scanned with CamScanner