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PHYSICS Cambridge Books - Coggle Diagram
PHYSICS Cambridge Books
Chapter 2 : Accelerated motion
Acceleration
form
a = v-u / t
Positive → speeding up
Negative → deceleration
Equations of Uniformly Accelerated Motion (SUVAT equations)
v = u+at
v^2 = u^2 +2as
s =ut + 1/2at^2
"Applicable only when acceleration is constant."
Free Fall & Gravity
Acceleration due to gravity: g = 9,81m/s^2
In free fall (ignoring air resistance):
Equations same as SUVAT
Graphs in Accelerated Motion
v–t graph:
Slope = acceleration
Area under curve = displacement
a–t graph:
Area under curve = change in velocity
Chapter 3 : Dynamics (Forces and Motion)
Newton’s Laws
3rd Law: Every action has equal and opposite reaction.
1st Law: Object stays at rest/moves uniformly if no resultant force (inertia)
2nd Law: F = ma- force causes acceleration
Forces
Weight = mg
Normal Reaction (R): Perpendicular to surface.
Friction (f): Opposes motion, 𝑓 = 𝜇𝑅
Tension (T): In strings/cables.
Air Resistance: Increases with speed.
Resultant Force
Net force = vector sum of all forces.
If 0 → equilibrium (constant speed / rest).
If ≠ 0 → acceleration.
Motion on Slopes
Parallel to slope: 𝑚𝑔 sin 𝜃
Perpendicular: R = mg cos 𝜃
Momentum & Impulse
p = mv
Ft = Δp
Momentum conserved in isolated systems.
Applications
Seatbelts: ↑ time → ↓ force.
Rockets: conservation of momentum.
Falling objects: reach terminal velocity when drag = weight.