X PHYSICS
UNIT – IV
DYNAMICS
1. Circular motion is a special case of ______________.
2. If the string of whirling stone is cut the stone moves in ______________.
3. Centre seeking force is called ______________.
4. Centrifugal force means ______________ force.
5. In a uniform circular motion, if the radius is doubled the centripetal force now required is ___________.
6. A particle undergoes an angular displacement of 90o. The value of angular displacement in radians ______________.
7. The speed of a wheel is 1800 r.p.m. The average angular velocity is ______________.
8. Express 0.210 rad in degrees ______________.
9. Force is that which changes the state of uniform ______________ of a body.
10. Examples for translatory motion ______________.
11. Examples for vibrating motion ______________.
12. Circular motion is the simplest of ______________ motion.
13. The line joining the particle to the centre of the circle is called a radius ______________.
14. The unit of angular displacement is ______________.
15. 1 revolution = ______________ radius.
16. 1 radian = ______________.
17. The rate of angular displacement is defined as ______________.
18. Angular velocity is ______________ in a uniform circular motion.
19. In a uniform circle motion the magnitude of linear velocity of the particle remains constant but its ______________ changes continuously.
20. The relation between ?, V and r is = ______________.
21. Earth goes round the sun because of ______________ of attraction between them.
22. The gravitational force of attraction provides the necessary ______________.
23. When electron revolves round the nucleus in an atom, the centripetal force is provided by the ______________ of attraction between them.
24. The magnitude of angular momentum (L) is = ______________.
25. The centripetal force causes the centripetal acceleration of the particle whose magnitude is _________.
26. Centrifugal force is also known as ______________.
27. A ______________ is used to separate particles of higher mass from the lower mass in a given mixture. 28. When a running car takes a sudden left turn, a man sitting in the back seat falls to the right due to ______________ of direction.
29. Centrifugal force is defined as a force within a rotating body because of which the body tends to move away from the centre along the ______________.
30. The centrifugal force also acts normal to the direction of motion of the body but radially outwards along the ______________.
31. The magnitude of centripetal force and centrifugal force is ______________.
32. ______ depends on the expected speed of vehicle and the radius of the curvature of the road.
33. Any motion that repeats itself along the same path in equal intervals of time is called ______.
34. Earth goes round the sun because of ______________ between them.
35. In the uniform circulatory motion of the earth, the linear speed of the particle will ________.
36. If T is the time period then 1/T = ______________.
37. If ‘f’ is the frequency and ? is the angular velocity then ? = ______________.
38. The domestic churner works on the principle of a ______________.
39. A body is moving in a circle with a constant speed it has ______________.
40. Honey is separated from bees wax one separates by ______________ method.
41. The angular velocity of a second’s hand in a watch is ______________.
42. The natural satellite of earth is ______________.
43. If the horizontal speed of an artificial satellite is increases the curvature of the path ________.
44. The orbital velocity of an artificial satellite is ______________ km/sec.
45. The angular velocity of earth is ______________.
46. The banking angle of a curved road is determined from the formula ______________.
47. ______________ force is a pull on the body towards the centre of a circle.
48. The time taken for any one oscillation by a given body is called its ______________.
49. A car moves on a curved but level road. The necessary centripetal force on the car is provided by _________.
50. Newton’s laws are valid in ______________.
51. Periodic motion is also called as ______________.
52. A body executing oscillatory motion comes to rest at ______________.
53. A particle in a uniform circular motion executes a periodic motion but not an ______________.
54. The maximum displacement of a particle in SHM is called ______________.
55. The time period of a simple pendulum is independent of __________ and _________ of the bob.
56. A particle in a uniform circular motion executes ______________.
57. A body is moving in a circular path with a constant speed. It has _____________.
58. The to and fro vibrations of an excited fork is an example of ______________.
59. The time period of a simple pendulum whose length is 100cm ______________.
60. At the equilibrium position of an oscillating pendulum potential energy is ______________.
X PHYSICS
UNIT – IV
DYNAMICS (Key)
(1) rotatory motion (2) tangential (3) centripetal force (4) centre fleeing force or a force directed away from the centre (5) half as great at before (6) 1.57 (7) 188.57 radian / second (8) 12o (9) motion (10) motion of flywheel, Motion of earth about its axis (11) sound waves (12) rotatory (13) vector (14) radian (15) 2p = 360 (16) 57.o 18' (17) angular velocity (18) constant (19) direction (20) V = ?r (21) gravitational force (22) centripetal force (23) electro static force (24) m?2r (25) v2/ r (26) fictitious force or pseudo force (27) centrifuge (28) inertia (29) radius (30) radius. (31) same (32) banking angle (33) periodic motion (34) gravitational force of attraction (35) remain constant (36) frequency (37) 2pf (38) centrifuge (39) a velocity of constant magnitude (40) centrifuge (41) p/30 rad/s (42) moon (43) decreases (44) 11 (45) 2p/24 rad/hour (46) Tan? = v2/rg (47) centripetal (48) time period (49) friction between the tyres and the road (50) inertial frame of reference (51) harmonic motion (52) mean position (53) oscillatory motion (54) amplitude (55) amplitude, mass (56) a periodic motion (57) an acceleration of constant magnitude (58) S.H.M (59) 2 seconds (60) minimum.
