Lecture-2
Physics
1. The second law of motion of Newton gives the definition of ________- Force
2. What is the SI Unit of Force ?- Newton
3. What is Linear Momentum ?- The product of the mass and the velocity of the body is called Linear Momentum. Mass * Velocity
4. Which type of quantity is the Linear Momentum ?- Vector
5. What is the unit of the Linear Momentum ?- Kg.ms-1
6.A ______ body has the a larger linear momentum than a ________ body moving with the same velocity.- Heavier, Lighter
7. If a force acts on a body for a very short time ,then the product of the force and time is called the ________. – Impulse
8. What is the SI Unit for Impulse ?- N/s
9. What is the Third Law of Newton ?- Every action have equal and opposite reaction.
10. If the result of all forces acting on the body is zero , the body is said to be in __________- Equilibrium.
11. If on slight displacement from equilibrium position a body has tendency to regain its original position , it is said to be in __________- Stable Equilibrium
12. If on a slight displacement from equilibrium position , body moves in the direction of displacement and does not regain its original position, the equilibrium is said to be ____________- Unstable Equilibrium
13. If on a slight displacement from equilibrium position a body has no tendency to come back to original position or to move in the direction of displacement , it is said to be __________- Neutral Equilibrium
14. What are the basic conditions to achieve a stable equilibrium ?
I. The centre of gravity of the body should be at the minimum height.
II. The vertical line passing through the centre of the gravity of the body should pass through the base of the body.
15. ______________ of a body (system of particles ) is a point where the entire mass of the body is supposed to be concentrated . – Centre of the Mass
16. If we slide or try to slide a body over a surface , the motion is resisted by a bonding between the body and the surface . The resistance is called _________.- Frictional Force
17. The opposite force that come into play when one body tends to move over the surface of another body but actually motion has yet not started is called __________. –Static Friction
18. The maximum value of the static frictional force which comes into play when a body just begins to slide over the surface of another body is called ?- Limiting Frictional Force
19. When two bodies actually roll on each other ( as in case of ball bearing ) , the _________ comes into play. –Rolling Friction
20. When two bodies actually slide over each other , _________ comes into play. Sliding Friction
21. When a body moves over the other body , then the force of friction acting between two surfaces in contact in relative motion is called __________- Kinetic Friction
22. What are the methods of the reducing friction ?
· By polishing
· By lubrication
· By proper selection of material
· By using ball bearing friction.
23. When a body is displaced by applying a force on it , then ______ is said to be done . – Work
24. Which kind of quantity is Work ?- Scalar
25. What is unit of Work ?- Joule
26. When force is applied along the direction of displacement , it is called _________- Positive Work Done
27. ________means the force is opposite to displacement. – Negative Work Done
28. If the force is perpendicular to the displacement and if either the force or the displacement is zero , work done is _______- Zero
29. _________ is defined as the capacity to do the work ?- Energy
30. What is the unit of energy under SI system ?- Joule
31. What is the unit of energy under the CGS System ?- Erg
32. What is the full form of CGS System ?- Centimeter – Gram- Second
33. What are the two forms of the Mechanical Energy ?
· Kinetic Energy
· Potential Energy
34. _________ is the energy possessed by a body by the virtue of its motion. – Kinetic Energy
35. ______ is the energy possessed by a body by the virtue of its position. – Potential Energy
36. What is the Law of Conservation of Energy ?- Energy can neither be created nor be destroyed but it can only be transformed from one form to another.
37. In a heat engine , heat energy changes into ___________- Mechanical Energy
38. In the electric bulb, the electric energy is converted into ________- Light Energy
39. In the burning coil , oil etc. the chemical energy changes into ________.- Heat Energy
40. In solar cell , solar energy changes into __________.- Heat Energy
41. In playing guitar , mechanical energy changes into ________. Sound Energy
42. In microphone , sound energy changes into _________. – Electric Energy
43. In loud speaker , electric energy changes into _________.- Sound Energy
44. In battery , chemical energy changes into ___________. –Mechanical Energy
45. In electric motor , electrical energy changes into ___________. – Mechanical Energy
46. In candle chemical energy changes into _____________- Light and Heat Energy
47. Rate of doing work by a body is called _______.- Power
48. What is the SI Unit of power ?- Watt or Joule per Second
49. Which kind of quantity is the power ?- Scalar
50. How many watts are there in a horse power ?- 746 Watt