Kinesiology 2241A/B Lecture Notes - Lecture 9: Angular Acceleration, Newton Metre, Angular Velocity
2 Feb 2017
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We have a linear rotation, and an angular rotation: angular aceeleratio, the time rate of change of our angular velocity, or the angle relative to time squared. This is ho(cid:449) it usually happe(cid:374)s : find an external force, calculating an external torque, there is also an internal torque, e. g. Achilles tendon, inserts on the back of the heel: since we are not pulling at the centre of the ankle joint, we are creating torque, we then create a plantar flexion torque at the ankle. We need the muscle to pull offset of the lever arm to cause rotation, this enables us to move our body. Every muscle in the body has a lever arm of some kind, maintined by the bone. Think of this as rotational mass, resistance body puts up for angular rotation. I = how far is the mass of the body we are trying to rotate away from the centre of rotation: figure skater.
