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Questions and Answers
What did Isaac Newton realize about the force acting on the planets and the moon?
What did Isaac Newton realize about the force acting on the planets and the moon?
- The same gravitational force is responsible for the motion of all these objects (correct)
- Each object is affected by a different force
- The moon is not affected by any force
- The planets are not affected by any force
What causes an object to change its speed or direction of motion?
What causes an object to change its speed or direction of motion?
- Magnetic force
- Frictional force
- Electric force
- Gravitational force (correct)
What made Newton start thinking about the force of gravity?
What made Newton start thinking about the force of gravity?
- An earthquake
- The fall of an apple near him (correct)
- The motion of the moon
- A flash of lightning
What did activity 9.1 involving a stone on a thread demonstrate about motion?
What did activity 9.1 involving a stone on a thread demonstrate about motion?
What factor does the force between two objects depend on, according to the universal law of gravitation?
What factor does the force between two objects depend on, according to the universal law of gravitation?
How is the constant of proportionality in the universal law of gravitation defined?
How is the constant of proportionality in the universal law of gravitation defined?
How did Henry Cavendish determine the value of the universal gravitation constant, G?
How did Henry Cavendish determine the value of the universal gravitation constant, G?
What is the SI unit of the universal gravitation constant, G?
What is the SI unit of the universal gravitation constant, G?
What does the law of gravitation state about the force of attraction between two objects?
What does the law of gravitation state about the force of attraction between two objects?
Why does a heavy object not fall faster than a light object, even though gravitational force acts on all objects in proportion to their masses?
Why does a heavy object not fall faster than a light object, even though gravitational force acts on all objects in proportion to their masses?
What is the magnitude of the gravitational force between the earth and a 1 kg object on its surface?
What is the magnitude of the gravitational force between the earth and a 1 kg object on its surface?
What happens to the force of gravitation between two objects when the distance between them is reduced to half?
What happens to the force of gravitation between two objects when the distance between them is reduced to half?
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