State the law of gravitation. Calculate ihe force beiween ihe earih and ihe sun if the mass of ihe sun = 2 x 1030 kg, mass of ihe earth = 6 x 1024 kg and the distance beiween ihe ear ih and ihe sun = 1.5 x |08 km.
Answers
Q2. Why is the weight of an object on the moon 1/6th its weight on the earth?
Ans. The weight of an object� depends on ‘g’ acceleration due to gravity, and the value of ‘g’ on earth: and moon is not same.
The mass and radius of the earth is more than the mass and radius of the moon.
As the weight of a body on the earth is 6 times more than the weight of a same body on moon.
QUESTIONS FROM NCERT TEXTBOOK
Q1. How does the force of gravitation between two objects change when the distance between them is reduced to half?
Ans.
The force of gravitation becomes 4 times more.
Q2. Gravitational force acts on all objects in proportion to their masses. Why then, a heavy object does not fall faster than a light object?
Ans. The heavy object when falls, the acceleration due to gravity ‘g’ is acting which is independent of the mass of the body.
Gravitation force is
∴ F and g are different.
Q3. What is the magnitude of the gravitational force between the earth and a 1 kg object on its surface?
[Mass of the earth is 6 x 1024 kg and radius of the earth is 6.4 x 106 m].
Ans. The magnitude of the gravitational force between earth and an object is given by the formula.
Newton's three laws of motion:
- Every object in a state of uniform motion will remain in that state of motion unless an external force acts on it.
- Force equals mass times acceleration [ ].
- For every action there is an equal and opposite reaction.
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