Physics XI Karachi Board Fill in the Blanks - Chapter 5

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 net torque 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 to rotate 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 of change 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 associated with __________ 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 __________.