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A level Physics, chapter 2 : accelerated motion - Coggle Diagram
A level Physics
chapter 3 : Dynamics
motion on slopes
Parallel to slope: šš sin š
Perpendicular: R = mg cos š
Momentum & impulse
Momentum conserved in isolated systems.
p = mv
Ft = Īp
Applications
Seatbelts: ā time ā ā force.
Rockets: conservation of momentum.
Falling objects: reach terminal velocity when drag = weight.
Forces
Friction (f): Opposes motion, š = šš
Weight = mg
Normal Reaction (R): Perpendicular to surface.
Tension (T): In strings/cables.
Air Resistance: Increases with speed.
Newtons law
1st Law: Object stays at rest/moves uniformly if no resultant force (inertia)
2nd Law: F = ma- force causes acceleration
3rd Law: Every action has equal and opposite reaction.
Resultant force
Net force = vector sum of all forces.
If 0 ā equilibrium (constant speed / rest).
If ā 0 ā acceleration.
chapter 2 : accelerated motion
Free Fall & Gravity
Equations same as SUVAT
Acceleration due to gravity: g = 9,81m/s^2
In free fall (ignoring air resistance):
Graphs in Accelerated Motion
vāt graph:
Slope = acceleration
Area under curve = displacement
aāt graph:
Area under curve = change in velocity
Acceleration
a = v-u / t
Negative ā deceleration
Positive ā speeding up
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."