Question

please give some important questions from system of particles class 11 physics for exam ​

Answer 1

Answer:

Question 1.

Can the geometrical centre and C.M. of a body coincide? Give examples.

Answer:

Yes, C.M. and geometrical centre may coincide when the body has a uniform mass density, e.g. C.M. and geometrical centre are the same in case of a sphere, cube and cylinder etc.

Question 2.

How does the M.I. change with the speed of rotation?

Answer:

M.I. is not affected by the speed of rotation of the body.

Question 3.

Under what conditions, the torque due to an applied force is zero?

Answer:

We know that τ = rF sin θ. If θ = 0 or 180,

or

r = 0, then τ = 0, r = 0 means the applied force passes through the axis of rotation.