Chapter 5 - Torque, Angular Momentum and Equilibrium
1. A body is said to be in equilibrium if it is at rest or is moving
with __________ velocity.
2. If a body is moving with uniform velocity then the body is said to
be in __________ equilibrium.
3. For the transnational equilibrium the net force acting on the body
must be __________.
4. For the rotational equilibrium, the nettorque acting on the body
must be __________.
5. The body is said to be in complete equilibrium if __________
acceleration as well as angular __________ is zero.
6. According to the first condition of equilibrium the algebraic sum
of all the forces acting on a body must be equal to__________.
7. If the algebraic sum of all torque acting on a body is equal to
zero then the body will be in __________ equilibrium.
8. The magnitude of torque is equal to the product of magnitude of
force and its __________.
9. The unit of torque is SI system is __________.
10. The vector product of force and displacement is known as __________.
11. The clockwise torque is taken as __________ torque.
12. If the lines of action of the two forces acting on the body are
not same then the body will be in __________ equilibrium.
13. The physical quantity, which tends torotate a body, is called __________.
14. The angular momentum of a body is conserved if the net __________
on it is zero.
15. The force which cannot be replaced by a single equivalent force
are said to form a __________.
16. __________ is defined as the time rate ofchange of angular momentum.
17. In the system international the units of angular momentum are __________.
18. The angular momentum of an isolated system is __________.
19. A body is said to be in __________ equilibrium, if the net force
on it is zero.
20. If the net torque on a body is zero then the body is said to be
__________ equilibrium.
21. A __________ body is that in which different particles always
maintain the same position relative to each other, whether the body is
at rest or in motion.
22. In rotational motion, different particles of the body perform
circular motion and the centers of all these circular orbits lie along
a straight line called the __________.
23. If a rigid body rotates with a constant angular velocity w, then
different particles of the body perform uniform circular motion with
the __________ angular velocity but __________ linear velocities.
24. The moment of inertia of a rigid body about a given axis of
rotation is equal to the sum of the products of the mass of each
particle of the body and the square of its __________ from the given
axis.
25. The __________ of a rigid body about a given axis of rotation is
given by I = Smr2 where 'm' is the mass of any particle of the body
situated at a distance 'r' from the axis.
26. The angular momentum of a particle is defined as the __________
product of the position vector and the linear momentum of the
particle.
27. The angular momentum L of a particle is given in terms of m, v, r
and q as L = __________.
28. The direction of the angular momentum of a particle lies along the
__________ to the plane formed by the vectors and .
29. The angular momentum of a particle can be expressed in the
determinant form as = __________.
30. The direction of the angular momentum of a particle moving with
velocity v in a circular orbit of radius r is __________ to the
direction of the angular velocity w which lies along the axis of
rotation.
31. The centre of gravity of uniform circular hoop is at the
__________ of the hoop.
32. The angular momentum is associatedwith __________ motion.
33. The total angular momentum is associated with __________ motion.
34. The total angular momentum of a system of particles is __________
if the net external torque acting on the system is zero..
35. The time rate of charge of angular momentum of a body is equal to
the __________.
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