Back to SYSTEM OF PARTICLES

JEE PHYSICS MCQ: SYSTEM OF PARTICLES

1 Medium

1 of 1

Understanding +4 | -1

Identify the correct statement. In the absence of external force,
a) the kinetic energy associated with the motion of centre of mass is conserved
b) Centre of mass is not accelerated
c) The centre of mass always move in curved line
d) Centre of mass must be at rest

View answer and explanation

Correct option: A

a

\&

b are correct

Option A is correct because in the absence of external force, the center of mass has constant velocity, implying constant kinetic energy and zero acceleration.

More Questions from SYSTEM OF PARTICLES

Practice All Chapter MCQs →

It is easier for a swimmer jumping into water from a height to describe a loop in the air by A uniform thin rod

\mathrm{AB}

\mathrm{L}

has linear mass density

\mu(x)=a+\frac{b x}{L}

x

is measured from

\mathrm{A}

\mathrm{CM}

of the rod lies at a distance of

\left(\frac{7}{12}\right) \mathrm{L}

\mathrm{A}

\mathrm{b}

are related as : A solid metal ring and a disc of same radius and mass are rotating about their diameters with same angular frequency. The ratio of their respective rotational kinetic energy values is When a torque acting upon a system is zero, then which of the following will be constant A point particle of mass

1.0 \mathrm{~g}

is rotating in a circle of diameter

8 \mathrm{~cm}

. Its moment of inertia will be The angular velocity of a particle is given by

\omega = {t^4} + 2{t^3}

then its angular acceleration of the particle at

t = 1\,sec

\left( {rad\,{s^{ - 2}}} \right)