Khalid is running in a perfect circle with a speed of 11 m/s. (The radius of the

Question

Khalid is running in a perfect circle with a speed of 11 m/s. (The radius of the circle is 7 m: Khalid has a mass of 89 kg.) A) Determine the magnitude of the force maintaining Khalid's uniform circular motion. B) Describe and explain in complete detail (using physics terms and ideas) what makes it possible for Khalid to travel in the circular path. Include in your description and explanation the application of both Newton's First Law and Newton's Third Law to the situation described in this problem. C) Explain, in detail, how centrifugal force is related to the situation described above.

Explanation / Answer

Solution:

A)

The cetripetal force is responsible for maintaining khalid run in a circular path

and as we know the centripetal force is given by:

Fc = mv2/r

=> Fc = (89)112/7

=> Fc = 1538.4285 N

B)

Any object moving in a circle (or along a circular path) experiences a centripetal force. That is, there is some

physical force pushing or pulling the object towards the center of the circle.an object in uniform circular motion

experiences an inward net force. This inward force is sometimes referred to as a centripetal force,

where centripetal describes its direction. Without this centripetal force, an object could never alter its direction. The

fact that the centripetal force is directed perpendicular to the tangential velocity means that the force can alter the

direction of the object's velocity vector without altering its magnitude.

C)

The centrifugal force is an inertial force ("pseudo" force) directed away from the axis of rotation that appears to act

on all objects when viewed in a rotating frame of reference.Hence we can say that this force depends on the frame

from which the system is viewed/observed.

The centrifugal force is an outward force apparent in a rotating reference frame; it does not exist when a

system is described relative to an inertial frame of reference!

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