Physics
An artifical satellite is moving in a circular orbit around the Earth. Which statement is correct ?
- A force is needed to keep it moving as its speed is changing.
- No force is needed as it is in space.
- A tangential force of gravity increases its speed.
- Centripetal force due to the Earth's gravity continuously changes the direction of velocity.
Force
2 Likes
Answer
Centripetal force due to the Earth's gravity continuously changes the direction of velocity.
Reason — A satellite moving in a circular orbit has constant speed but its direction of velocity keeps changing and this change in direction requires a centripetal force. The Earth’s gravitational force provides this centripetal force, continuously changing the direction of the satellite’s velocity and keeping it in orbit.
Answered By
3 Likes
Related Questions
The direction of centripetal force is always :
- along the tangent at that point of the circular path
- towards the centre
- outwards from the centre
- none of the above
Centrifugal force is :
- a real force
- the force of reaction of centripetal force
- a fictitious force
- directed towards the centre of the circular path
Clothes in a dryer of a washing machine appear to stick to the drum walls during spinning. What provides the necessary centripetal force to keep the clothes moving in a circle.
- gravitational force
- friction between clothes
- tension in clothes
- drum wall
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.