The motion of a rigid body which is not pivoted or fixed in some way is either a pure ...A... or a combination of translation and rotation. The motion of a rigid body which is pivoted or fixed in some way is ... . Here, and refer to
rotation and translation
translation and rotation
translation and the combination of rotation and translation
None of the above
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The motion of a rigid body which is not pivoted or fixed in some way is either a pure translation or a combination of translation and rotation. The motion of a rigid body which is pivoted or fixed in some way is rotation.
In rotation of a rigid body about a fixed axis, every ...A...of the body moves in a ...B..., which lies in a plane ...C... to the axis and has its centre on the axis. Here, and refer to
particle, perpendicular and circle
circle, particle and perpendicular
particle, circle and perpendicular
particle perpendicular and perpendicular
In rotation of a rigid body about a fixed axis, every particle of the body moves in a circle, which lies in a plane perpendicular to the axis and has its centre on the axis.
The position of centre of mass of a system of particles does not depend upon the
symmetry of the body
position of the particles
relative distance between the particles
The position of centre of mass of a system depends upon mass, position and symmetry of the body.
The mass per unit length of a non - uniform rod of length varies as where is constant. The centre of mass of the rod will be at ;
The motion of the centre of mass depends on
total external forces
total internal forces
sum of (a) and (b)
None of these
A stick is thrown in the air and lands on the ground at some distance from the thrower. The centre of mass of the stick will move along a parabolic path
in all cases
only if the stick is uniform
only if the stick has linear motion but no rotational motion
only if the stick has a shape such that its centre of mass is located at some point on it and not outside it
motion of the and motion about the
motion about the CM and motion of one star
position of the and motion of the
motion about and position of one star
When no external force acts on the binary star, its CM will move like a free particle [Fig. (a)]. From the CM frame, the two stars will seems to move in a circle about the CM with diametrically opposite positions.
(i)
(ii) (i) Trajectories of two stars. (dotted line) and (solid line) forming a binary system with their centre of mass in uniform motion
(ii) The same binary system, with the centre of mass at rest. So, to understand the motion of a complicated system, we can separate the motion of the system into two parts. So, the combination of the motion of the CM and motion about the could described the motion of the system
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