What's a torque wrench? It's a referee, says Greg Katsis, marketing manager for Sturtevant Richmont, a manufacturer of torque-measurement systems in Franklin Park, Ill. It makes sure that big, burly ...

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A weight is fixed at various distances from a handle. As the weight is moved along the bar, the work it takes to pivot the bar upwards about the handle changes noticably. Get a strong-looking student ...

Equipment: A 1 meter long aluminum bar with a handle, a moveable hook and a 1kg weight. Optional: a spring scale and a ring stand. What it does: The weight is hung on the movable hook at various ...