Physics
Which of the following is an example of uniform circular motion?
- a car accelerating on a straight road
- a pendulum swinging back and forth
- a satellite orbiting the earth at a constant altitude
- a ball rolling down a hill
Force
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Answer
a satellite orbiting the earth at a constant altitude
Reason —
A satellite orbiting the Earth at a constant altitude experiences uniform circular motion because it maintains a constant speed while continuously moving along a circular path around the Earth.
The car moving along a straight path and may be changing its speed, but it is not following a circular path.
A pendulum exhibits periodic motion as it swings back and forth due to gravity but it is not circular motion.
The ball is rolling along a sloped path, not a circular one.
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Centrifugal force is :
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- directed towards the centre of the circular path
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- none of the above
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Give one example of motion in which speed remains uniform, but the velocity changes.