Kinesiology 2241A/B Lecture Notes - Lecture 8: Angular Acceleration, Calcaneus, Gastrocnemius Muscle
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27 Mar 2018
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Moment of force (aka torque) according to newton"s 2nd law, when a force is applied to an object, then it accelerates in a straight line. The force must be applied at the center of mass. If you apply a force directly through the center of mass, it will accelerate linearly. If the force is not applied to the com, then the com is accelerated and the body rotates. You can"t separate linear and angular acceleration, 98% of the time the two go together. When you apply a force, you get a linear effect and a rotational effect. The force x perpendicular distance from the com is the torque applied: this distance is called the moment arm of the lever arm. So long as you are in the air, you will rotate about your com. The bigger the lever arm, the greater the rotation. But you still always get some linear acceleration in the same direction as the force.
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