Dynamics

Inertia, mass, acceleration
a1/a2 = m2/m1
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Force, mass, acceleration
F = ma
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Gravity force
N = mg
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Friction force
F_tr = μN
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Friction force
F_tr = μmg
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Law of universal gravitation
F = G(m1*m2)/r^2
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Centripetal acceleration of satellite
a = v^2/(R+h)
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Speed (velocity) of satellite
v = saknis(G*M/(R+h))
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First cosmic velocity (move in a circular orbit)
v = saknis(gR)
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Second (escape) cosmic velocity (overcome gravity)
v = saknis(2gR)
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Kepler's Third Law
T1^2/T2^2 = a1^3/a2^3
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Free fall acceleration at the earth's surface
g = G*M/R^2
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Body weight
P = mg
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Body weight: weightlessness
P = m(g-a)
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Body weight: overload
P = m(g+a)
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Braking (stopping) time
t = mv/F_tr
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Braking (stopping) time
t = v/μg
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Braking (stopping) distance
s = mv^2/(2*F_tr)
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Braking (stopping) distance
s = v^2/(2μg)
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Rolling friction force
F_tr = μN/R
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Elastic force
F_tampr = k x
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Kinetic energy or rotating body
W_k  = J ω^2/2
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