Question

Multiple choice question. 1) When a particle performing UCM in a horizontal circle the physical quantity that does not remain constant a) speed b) kinetic Energy c) magnitude of linear momentum d) velocity​

Answer 1

Answer:

velocity

Explanation:

it changes distance and accerlation

Answer 2

Answer:

When a particle performing UCM in a horizontal circle the physical quantity that does not remain constant is velocity i.e.option(d).

Explanation:

• When a body performs uniform circular motion its velocity changes at every point of motion.

• This velocity change is only in terms of direction not in terms of magnitude.

Now let's analyze the options one by one.

• Speed-it remains constant as the motion is uniform circular motion.
• Kinetic energy(E)-

                    $E=\frac{1}{2} mv^2$    (1)

           m=mass of the body

           v=speed with which the body is moving

Since speed is constant. So, kinetic energy will also remain constant.

• Linear momentum(P)-

                        $P=mv$       (2)

The magnitude of linear momentum will also remain constant.

• Velocity(V)- it does not remain constant in a uniform circular motion as the velocity of the body changes at every point on the track in terms of direction.          

Hence, when a particle performing UCM in a horizontal circle the physical quantity that does not remain constant is velocity i.e.option(d).

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