Chapter 10
In Chapters 8 and 9, we have learnt aboutthe motion of objects and force as the causeof motion. We have learnt that a force isneeded to change the speed or the directionof motion of an object. We always observe thatan object dropped from a height falls towardsthe earth. We know that all the planets goaround the Sun. The moon goes around theearth. In all these cases, there must be someforce acting on the objects, the planets andon the moon. Isaac Newton could grasp thatthe same force is responsible for all force is called the gravitational this Chapter we shall learn aboutgravitation and the universal law ofgravitation. We shall discuss the motion ofobjects under the influence of gravitationalforce on the earth. We shall study how theweight of a body varies from place to shall also discuss the conditions forobjects to float in GravitationWe know that the moon goes around theearth. An object when thrown upwards,reaches a certain height and then fallsdownwards.
(iii)the motion of planets ar ound the Sun; and (iv) the tides due to the moon and the Sun. 10.2 Free Fall Let us try to understand the meaning of free fall by performing this activity. Activity _____10.2 • Take a stone. • Throw it upwards. • It reaches a certain height and then it starts falling down. We have learnt that the earth attracts
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