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
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.
Related Questions
Centrifugal force is :
- a real force
- the force of reaction of centripetal force
- a fictitious force
- directed towards the centre of the circular path
The difference between centrifugal force and centripetal force is :
- they both act in the same direction
- they both act in opposite direction
- they both have different magnitudes
- none of the above
Assertion (A): When a beam is in static equilibrium, the sum of clockwise moments is equal to the sum of anticlockwise moments.
Reason (R): According to the principle of moments for a body in equilibrium, the sum of moments acting in one direction must be equal to the sum of moments in opposite direction.
- Both A and R are true and R is the correct explanation of A.
- Both A and R are true and R is not the correct explanation of A.
- assertion is false but reason is true.
- assertion is true but reason is false.
Assertion (A): A heavier object placed at a far distance from the pivot point will have the same moment as a lighter object placed close to the pivot point.
Reason (R): The moment of force is determined by the magnitude of the force along with its distance from the pivot point.
- Both A and R are true and R is the correct explanation of A.
- Both A and R are true and R is not the correct explanation of A.
- assertion is false but reason is true.
- assertion is true but reason is false.