physics-9-chapter-4-turning-effect-of-force-1


1. Who was the first man to come up the idea of gravity?




2. When Isaac Newton was trying to solve the mystery why planets revolve around the Sun?





3. When Isaac Newton was trying to solve the mystery why planets revolve around the Sun, what fall from the tree under which he was sitting?




4. Which idea was flashed in the mind of Newton when he saw an apple falling from the tree?




5. Who concluded that the force which causes an apple to fall on the Earth and the force which keeps the moon in its orbit are of the same nature?




6. What is the force called with which everybody attracts every other body in this earth?




7. Who called the force with which everybody attracts every other body in this earth as force of gravitation?




8. Which law of Newton states that: “Everybody in universe attracts every other body with force which is directly proportional to product of their masses and inversely proportional to square of distance between their centres”?




9. Which of the following is CORRECT about force of gravitation?




10. Which of the following is directly proportional to the force of gravitation?




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