Rigid body mechanics

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Description and Tags

uniform rotational motion and torque and whatever else belongs to that

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12 Terms

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angular displacement (θ)

the change in angle through which a rigid body has rotated relative to a fixed point; s = rθ; measured in radians

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angular velocity

the rate of change of angular displacement; ⍵ = θ/t; measured in radians/second

3
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linear velocity

v=r⍵

4
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angular acceleration

the rate of change of angular velocity; 𝛼=⍵/t or 𝛼=v/rt

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linear (tangential) acceleration

a=r𝛼

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centripetal acceleration

a=r⍵² or a=v²/r

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moment of inertia

the resistance to a change of rotational motion, depending on the distribution of mass around the axis of rotation; I=mr² or I = L/⍵; measured in kgm²

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torque

depends on the object’s moment of inertia; 𝜏=I𝛼 or 𝜏=L/t

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angular momentum

L=I⍵ or L = mvr

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Angular impulse

ΔL=𝜏 ⋅ t or change in angular momentum

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rotational kinetic energy

KE = ½ I⍵² or KE = L²/2I

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centripetal force

∑maC or mv²/r or mr⍵²