Force, Energy

1. What is a force?
2. is a push or a pull acting on an object.
3. What is Energy?
4. is the ability to do a work.
5. What is friction?
6. is a force that resists relative motion between two surfaces in contact.
7. What is a lever?
8.  is a bar that can be moved about a fixed point called fulcrum.
9. What is a machine?
10.  A device used to make work easier.
11. What is an inclined plane?
12.  A gradual sloping surface connected from a lower level to
13.  a higher level.
14. 
15. In which way it helps?
16. It takes less effort to push a heavy object up a gentle sloping ramp. than it does to pick up a steep slope.
17. Give some examples/
18.  Ramp, A flight of stairs,
19. escalator, and ladder.
20. What is a screw?
21. A type of an inclined plane around a rod.
22. Every turn of the groove is a tiny inclined plane..
23. What is a wedge?
24. is an inclined plane with a slanting edge.
25. Examples:knife,axe and spear.
26. 
27. What is Wheel and axle?
28. they together form a simple machine. A piece of rod
29. attached to the center of a wheel.fixed to the axle moves with less effort.
30. Example.Washing machine, Steering wheel of a car/
31. 
32. What is a pulley?
33. It is a wheel with a rope or a cable around it.
34. It can be movable or fixed to a support.
35. What is the benefit?
36. When more than one pulley is linked with some cable around them,they help in lifting heavy load or lowering heavy load
37. with less effort. 
38. Examples: crane, flag pole
39. 
40. What is a lever?
41. is a bar that can be moved about a fixed point fulcrum.
42. 
43. what are the 3 components of Lever.
44. The three parts of a lever is the fulcrum, load and the effort
45. Fulcrum or the support.
46. The position of the bar which bears the load.
47. What are the 3 types of lever.
48. 1st class order: 
49. the fulcrum is in the middle.
50. Scissors, hammer, and physical balance
51. 
52. first-class levers are see-saws, crowbars, pliers, scissors (which use two first-class levers together), and a hammer pulling a nail.
53. 2nd  class order lever.
54. The load is in the middle.
55. common second-class levers are doors, staplers, wheelbarrows, and can openers.
56. nut cracker, lemon squeezer and wheel barrows,
57. 3 rd class order lever.
58. The effort is in the middle.
59. Fishing rod, spade and tongs.
60. a broom, a hoe, a fishing rod, a baseball bat, and our own human arms.
61. Write about energy conversion.
62. Electric kettle: Electrical to Heat energy.
63. Radio: Electrical energy to Sound energy.
64. Electric Train: Electrical energy to Mechanical energy.
65. Solar cooker: Light energy to heat energy.
66. https://www.shutterstock.com/search/energy+conversion