This video in a creative/strange way, explains torque and lever arms. A lever arm gives a better torque, meaning that when you are unable to unscrew a screw, increasing the length of the lever arm will here increase the torque, therefore help move the screw much easier.
This is a really great source! In your description, you gave a clear and precise definition of what a lever arm is and what it does. Great source, keep it up!
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