science
Grade-3
Easy
Question
A ball is thrown up in the air. Initially, the ball moves upwards, i.e., against the direction of the gravitational pull of the Earth and then starts moving towards the Earth. Does it mean that the ball was not subjected to the Earth’s gravity when it was moving upwards?
- No
- Yes
- Sometimes
- None of the above
Hint:
Compare the two forces acting on the ball at every phase of its course - gravitational force and acceleration of the ball.
The correct answer is: No
During the ball's upward motion, its acceleration is greater due to the force of gravity. When these two equal, the ball stops and then the force of gravity is greater than the acceleration of the ball. Hence, the ball starts moving towards the ground. Therefore, gravity acts on the ball throughout its entire course.
Therefore, No it is not correct to say that gravity does not act on the upward course of the ball.
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