OBJECTIVE: Rescue personnel shall become familiar with the application of commercial heavy wreckers and recovery services to assist at incidents involving large transportation vehicles. TASK: Given a ...

Pulley systems are simple machines that make lifting heavy objects easier. They consist of a rope or cable that passes over one or more wheels (pulleys). A single pulley changes the direction of force ...

A pulley is a simple machine using a wheel and a cord that's designed for lifting. A pulley is a simple machine using a wheel and a cord that's designed for lifting. Pulleys help make work easier by ...