Artwork: How pulleys work#2: With two wheels, it's as though the weight is hanging from two ropes (the two strands of the same rope on the left), and a pulley halves the lifting force you need. It's like lifting the weight with two ropes instead of one. But you now have to pul...
The more work you have to do to draw a bow, the more energy it can transfer to an arrow. Compound bows use pulleys to help people do more work on the bow with less physical effort. In addition, when fully drawn, a compound bow's pulleys often hold part or even most of the draw ...
If you want to transport objects to a higher height or want to test out physics, build an elevator pulley. Pulleys are simple wheels with grooved rims that are pulled by a rope. Pulleys are useful for elevators because they lift more than their weight. The longer the string length, the m...
The more work you have to do to draw a bow, the more energy it can transfer to an arrow. Compound bows use pulleys to help people do more work on the bow with less physical effort. In addition, when fully drawn, a compound bow's pulleys often hold part or even most of the draw ...
Explore the simple machine known as a fixed pulley and its characteristics. Discover the parts of a fixed pulley, how it manipulates a load to make work easier, and examples of fixed pulleys used today. Related to this Question What is a pulley?
The science behind cranes is easy to understand—they're essentially pulleys and levers working together—but it still leaves plenty of interesting questions. Why are there so many different crane types? Why would you choose one rather than another? How much can a crane lift before it buckles ...
Given that the pulleys introduce a possible source of error because of their possible friction, why are the pulleys used at all? Why doesn't the force of gravity change the speed of a bowling ball as it rolls along a bowling lane? Explain how physics work in High jumping. How can we ...
Levers belong to a class of devices known as simple machines, which also includes gears, pulleys, inclined planes, wedges and screws. (The word "machine" itself comes from a Greek word that means "help make easier.") ...
CVTs also have various microprocessors and sensors, but the three components described above are the key elements that enable the technology to work. HowStuffWorks The variable-diameter pulleys are the heart of a CVT. Each pulley is made of two 20-degree cones facing each other. A belt rides...
the occupants of the spacecraft are in a state of freefall with the spacecraft itself. Most sci-fi films depict weightlessness by having the actors attached to wires and pulleys during filming. In Ron Howard's film "Apollo 13," the weightless scenes were shot on board NASA's KC-135 "Vom...