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Full Playlist Link:   • Class 9 Physics (New Session 202324)...  

✅ In this video,

✔ Class: 9
✔ Subject: Physics
✔ Chapter: Force and Laws of Motion
✔ Topic Name: Newton’s Second Law of Motion
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00:00 Introduction: Force and Laws of Motion
00:04 Newton’s Second Law of Motion
25:20 Website Overview
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Newton’s Second Law of Motion

Change in momentum can be calculated as:
Case 1: P = Pf Pi
= mv mu
= 2(5) 2(0)
P = 10 kg m/s
Case 2: P = Pf Pi
= mv mu
= 2(10) 2 (0)
= 20 kg m/s
Hence proved
Force ∝ Change in momentum
More the force more will be change in momentum.

Force ∝ 1/t
Where, t = time at which momentum velocity changes
Comparing both the concepts
Force ∝ p/t
Force ∝ (mv mu)/t
Force ∝ m(v u)/t
Force ∝ ma
Force = Kma (k = proportionality constant i.e. value of k in SI unit is 1)
Force = mass x acceleration .

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