• Gi: A judo gi is the Japanese name for a traditional judo uniform used in practice and competition.    

  • Kuzushi: The act of tori breaking the balance of uke.

  • Tsukuri: Tori getting into position near uke’s body and getting ready for the execution of the throw.

  • Kake: Tori finishing the throw.  

  • Uke and tori: Uke refers to the person who “receives” a technique. Tori refers to the executor of a technique. In another words, Tori is the thrower in a move and uke is the person being thrown.

  • Angular acceleration: Angular acceleration is the rate of change of angular velocity, often represented by Alpha (α).  

  • Angular position: the angle at a specific point in time made by an object in relation to a fixed reference axis.

  • Angular velocity(ω): is the rate of change of the angular position of a rotation object.

  • Base of support: Base of support is the area under an object that includes every point of contact with the supporting surface. For example, when a human is standing, the base of support would be the surface area of their bottom of feet combined with the area between.

  • Center of mass: Center of mass is the average position of all the parts of a subject, weighted according to its mass.

  • F: Force

  • g's: Used to describe accelerations as multiples of accelerations due to gravity.

  • l: Length

  • m: Mass

  • Moment of inertia: Moment of inertia is the tendency of an object to resist angular acceleration. The base formula for moment of inertia is I=ΣMr^2. The moment of inertia of a solid cylinder (perpendicular to center axis) is ¼ mr^2 + (1/12)ml^2.

  • Momentum: Momentum is a quantity of motion of a moving object. The more momentum an object has, the harder it is to stop the object from moving. The formula for linear momentum is p=mv.

  • Normal Force: When an object makes contact with a surface, the surface exerts a force perpendicular to the surface on the object.

  • r: Radius

  • Static Friction: The friction that exists between a stationary object and the surface on which it's resting.

  • Tangential Acceleration(atan): A measure of how quickly a tangential velocity changes, atan=(radius of the rotation)*(angular acceleration)

  • t: Time 

  • Torque: The tendency of a force to rotate an object about an axis

Judo & Physics
Photo credit: Zhaofan Chen, Model: Andrew Hoffman-Patalona

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