Learn More about "Force."1

1. http://easyscienceforkids.com/all-about-force-push-and-pull/
2. Let us  learn these words first.
3. Push and pull.
4. Force.
5. Muscular Force.
6. What can the force make?
7. Make the object move.
8. Make a moving object go faster or slower.
9. Make a moving object Stop.
10. Make a moving object change its direction.
11. Different kinds of Forces.
12.  Muscular force. Squeeze tube of tooth paste.
13. And mom  rolling out Chappathi from wheat dough.
14. Electrical force moves the fans and machines work.
15. Magnetic force attracts the pins and clips.
16. Magnet can attract only  things of iron or steel.
17. North pole repels the South pole.
18. South Pole repels the North pole.
19. But the North pole attracts the South pole of the magnet.
20. Earth is the biggest magnet.
21. The magnetic force of the earth attracts all objects towards it.
22. http://csep10.phys.utk.edu/astr161/lect/history/newtongrav.html 
23. https://www.youtube.com/watch?v=4ij5OgJatgc
24. Friction.
25. Friction is a common force that stops all moving objects.
26. It is more when the object moves on a rough surface.
27. Why do the doors in our house  make a creaking noise?
28. Because there is friction.
29. How to stop that noise and the friction? apply oil or lubricants,
30. What can the oil or lubricants do? reduce friction.
31. When can the object have   less friction?
32. If the object is put on the wheels and rolled.
33. Learn these words.
34. Attract.electrical force. friction. gravity. lubricant.
35. Magnetic force.Muscular force. Pull, Push, repel,rough,
36. Smooth,Surface,trolley, wheels. 
37. xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
38. Push X Pull
39. force,friction,
40. Smooth X  rough.