Question

Class 9 Explain Centripetal Force​

Answer 1

Explanation:

A force acting on a moving body at an angle to the direction of motion, tending to make the body follow a circular or curved path. The force of gravity acting on a satellite in orbit is an example of a centripetal force; the friction of the tires of a car making a turn similarly provides centripetal force on the car.

Answer 2

Explanation:

Centripetal Force

When a body is moving uniformly along a circular path, the magnitude of its velocity remains constant, but it's direction on its own. So, a body moving along a circular path is under the influence of an external force acting perpendicular to the direction of velocity and always directed towards a fixed point. This force is called 'centripetal' force. It's value depends on the mass of the body, magnitude of its velocity and the radius of the circular path described.

Centripetal force =

$mv {}^{2} \div r$

Here, m is the mass of a body, v is the magnitude of the velocity or speed of the body and r is the radius of the circular path. Example: One end of a string is tied to a stone and the other end of the string is tied to a finger and is whirled in a vertical plane.

Centripetal force is exerted by the finger in the stone, and appears as a tension in the string.