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9:41

Cheat sheet

Physics · Mechanics

Mechanics · Exam prep

1 page

Kinematics

v = dx/dt · a = dv/dt

Uniform: x = x₀ + vt

Accelerated: v² = v₀² + 2aΔx

Newton’s laws

1st: ΣF = 0 ⇔ constant v

2nd: ΣF = ma

3rd: F(A→B) = −F(B→A)

Energy

KE = ½mv² · PE = mgh

E = KE + PE

Conserved without friction

Work

W = F·d·cos θ

ΔKE = ΣW (work-energy)

Weight: W = ±mgh

Momentum

p = mv

Conserved if system isolated

Collisions: Σp before = after

Friction

f = μN, with μs > μd

Static, then kinetic

Always opposes motion

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