Physics Mechanics Summary & Formula Notebook (Complete Revision Guide)

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Physics Formula
Digital Notebook
➢ Mechanics
Lesson - wise formulas, symbols, units,
and quick revision notes for Physics


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© DinuuNOVA | Physics Formula Notebook
1
– Mechanics

,➢ Mechanics

1) Vectors
2) Linear motion
3) Newton’s law of motion
4) Moment of force
5) Center of gravity
6) Law of conservation of LM
7) Work, energy & power
8) Rotational motion
9) Circular motion
10)Hydrostatics
11) Hydrodynamics

If you truly have the hunger for
success, you will always find the
energy to work for it.

© DinuuNOVA | Physics Formula Notebook
2
– Mechanics

, 1 - Vectors
Resultant of Two Perpendicular Vectors

- vectors are perpendicular (90°).

❑ Resultant Force 𝑃 𝑅 𝑅 𝑃


R = 𝑃2 + 𝑄2
∝ ∝
𝑄 𝑄
This equation is derived from Pythagoras’ theorem.

𝑥 2 = 𝑎2 + 𝑏 2 𝑥 𝑎

𝑥= 𝑎2 + 𝑏 2 ∝
𝑏

❑ Direction of the Resultant Force

𝑄 𝑄
𝛼 = tan−1
𝑃 𝛼
𝑃
Note:
sin 𝜃
𝛼 = tan−1 𝑄 - Opposite → sin θ
cos 𝜃
𝜃
𝑄
𝛼 = tan −1 𝑃 - Adjacent → cos θ
𝑃



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3
– Mechanics

, Resultant of Two Perpendicular Vectors

- The vectors are non-perpendicular (θ ≠ 90°).


❑ Resultant Force
Q R
𝑅= 𝑃 2 + 𝑄 2 + 2𝑃 Qcos 𝜃
𝜃 𝛼
P

❑ Direction of the Resultant Force


−1
Q sin θ R
𝜃 = tan Q
𝑃 + 𝑄 cos θ
𝛼
P


Note:
R
Q 𝑄 sin 𝜃

𝛼 𝜃
P 𝑄 cos 𝜃

𝑃 + 𝑄 cos θ



© DinuuNOVA | Physics Formula Notebook
4
– Mechanics