## anonymous one year ago Physics Define Newton's first law, second law, as well as third law with full solution within single answer. First person to have the most accurate wording will be awarded medals from all participants.

1. anonymous

Newton' first law=inertia

2. anonymous

*full solutions

3. anonymous

inertia=an object will keep moving unless unless acted upon by an unbalanced force

4. anonymous

correct

5. imqwerty

1st law - a body tends to remain at its original position. :) nd this is called inertia .example - when u shake a tree the fruits fall down cause they try to resist any change in their original position nd thus they fall :)

6. anonymous

second law: when force is applied to an object, acceleration is made

7. anonymous

8. imqwerty

lol :D

9. anonymous

@heretohelpalways not quite. Pay attention to the proportion

10. anonymous

between the force applied and resulting acceleration.

11. anonymous

with mass being the constant

12. anonymous

As well as the resulting acceleration with changing mass with constant being the force applied.

13. anonymous

Try to draw a relationship and describe each of them

14. anonymous

mass*acceleration=force

15. anonymous

yes

16. anonymous

BUt

17. anonymous

Try to explain the relationship between the amount of force applied and resulting acceleration.

18. anonymous

AND relationship between mass and acceleration given a force assumed to be constant

19. anonymous

example: 300*0.07= 21 newtons

20. anonymous

Yes.

21. imqwerty

:)

22. anonymous

Final answer being the applied force and resulting acceleration have a PROPORTIONAL RELATIONSHIP whereas mass and acceleration has INVERSE PROPORTIONAL RELATIONSHIP when force is kept constant.

23. anonymous

In essence.

24. imqwerty

25. anonymous

elaborate

26. anonymous

balanced forces=net force of zero=that's not the case

27. anonymous

hmmmmm, I'll think of something

28. anonymous

Oh astrophysics came

29. anonymous

recoil of a gun when it fires

30. anonymous

That's a spot on

31. anonymous

can you elaborate the concept?

32. anonymous

Why aren't you shooting yourself with that? Why does recoil not kill you? Account for the drastic difference of surface areas being responsible for dispersion of forces into two opposite directions perfectly alined with one another.

33. imqwerty

example of 3rd law - when u walk u put force on ground nd the ground puts a normal force on u wid the help of which u can walk :)

34. anonymous

sorry, got to go now. I am being serious. I'll answer this question again later or tomorrow. I'll give a medal to imqwerty.

35. anonymous

Great! I hope you enjoyed my contest series @heretohelpalways

36. anonymous

I aim to make this stimulating for everyone .

37. anonymous

Mr. Astrophysics what have you got to say?

38. imqwerty

:) #%#\$%

39. Astrophysics

I'll keep it simple I suppose. Newton's first law is a body acted on by no net forces with constant velocity (that means 0 acceleration) you can see this with a linear position time graph. You can also see this on a ice hockey table, the slicker the surface further the puck slides (given an initial velocity of course). So what you want to see from here is that when a body is at rest or moving with a constant velocity, we say it's at equilibrium, mathematically. $\sum \vec F = 0$ don't forget the components! Newton's second law of motion is simply is net force = mass x acceleration, $\sum \vec F = m \vec a$ writing it out we can say if a net external force acts on a body, the body accelerates. The direction of acceleration is the same as the direction of the net force where the m x a = the net force. I think you can think of your examples for this, pretty straight forward. Newton's third law often called action - reaction, it is stated as if a body A exerts force on body B (action) , then the body B exerts a force on body A (reaction), the two forces have the same magnitude but are opposite in direction. $\vec F_{A~on~B} = - \vec F _{B ~ on~A}$ it's like a rocket blasting off, or kicking a ball, anything really. Hope that helps!

40. anonymous

@imqwerty medal to astrophysics

41. Astrophysics

Haha, thanks :)

42. anonymous

Are you a professional physicist?

43. Astrophysics

Nope! But I do aspire one to be!

44. Astrophysics

We do have one professional physicist here @Michele_Laino :-)

45. anonymous

Wow

46. anonymous

Are you taking physics in your unit I assume?

47. Astrophysics

Yup! I still have a long way to go haha.

48. anonymous

Certainly any degree of comparison would be absurd to 1st year medical student. XD

49. anonymous

Physics is just super amazing

50. Astrophysics

Haha, well medical students run away from physics :P

51. Astrophysics

Thanks for the medal, it was fun!

52. anonymous

Likewise! See you around.

53. imqwerty

:D

54. anonymous

`

55. anonymous

Interesting, Newton formulated his Second Law as a way to define acceleration, saying that a net force acting on a mass produces an acceleration in the same direction as the net force, i.e.$\vec{a} = \frac{ \vec{F} }{ m }$Only later was it adopted in its now familiar form$\vec{F} = m \vec{a}$

56. Astrophysics

Actually Newton proposed his second law as such, considering momentum $\vec F = \frac{ d \vec p }{ dt }$