To extract the nail without a hammer, you could try to grip it between your fingers and pull up with all your might. But the force required to pull that nail even an inch will likely be m… See more

Cranes use this same basic principle to help them move heavy loads. Their long arms (booms) act as levers. The center pin of the crane is the fulcrum, like the head of the hamme… See more

For big lifts, counterweightsthat weigh several hundred tons are attached to the base of the crane to prevent it from tipping over during lifts. The load is farther from the center pin t… See more

Cranes also work by using pulleys. The simplest pulleys are nothing more than a wheel held in place (fixed) with a rope looped over it. If you want to lift a load up, you can att… See more

Cranes work by using pulley systems to change the direction of the force needed to lift a load and to distribute that force over a greater distance. At the far end of the boom rests the m… See more