Torque causes rotation. It is equal to force multiplied by lever arm [torque=force X lever arm]. The farther the lever arm is from the axis of rotation, the less force is required for an object to rotate. A paddle is required in order to kayak. One of the key points of this paddle, is how you hold it. The farther apart you place your arms, the easier it will be to paddle because the lever arm will be increased and the force required to move the paddle will be much less than if you were to hold the paddle with your arms close together. Although your rotational inertia would decrease because you would be holding the paddle closer towards its axis of rotation, the lever arm would be decreased therefore the force required to move the kayak would increase.
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