This video explores different methods that can be use to amplify a force, and focuses on three types of machine - levers, pulleys and gears. The amplification of a force is called mechanical advantage ...

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(Sandy Bressner) Kelly Hunecke was all fastened up with a harness around her shoulders, waist and thighs, a protective helmet on her head, attached to a pulley anchored to a ... instead of putting all ...