Question

The moon is acted by gravitational pull on earth , still it does not fall on the earth. Explain why ? Determine the ratio of weight of an object of mass 50 kg on earth and on moon.(thake gearth = 10 m per second square ) ( gearth = 6gmoon )

Answer 1

The moon doesn't fall on earth because the moon too applies a force towards earth and these forces cancel each other so there is no apparent movement of moon towards earth.

Weight on earth = mass * g
So, 50*10 = weight of the object on earth
= 500 KgF

Weight on moon = 1/6 * 500 = 250/3

so ratio = 500/250/3 = 6/1
=> ratio = 6 : 1

Answer 2

Answer:  Although moon is acted by gravitational pull of the earth, this force is used up to provide centripetal force required for uniform circular motion of moon around the earth. As a result, the moon does not fall on earth and continues in its uniform circular motion.

Mass of obj. (m) = 50 kg and g on earth = 6 g on moon

Weight of obj. on earth / Weight of obj. on moon = m g on earth / m g on moon  = g on earth / g on  moon = 6

Ratio = 6:1

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