explain why a machine that has an output force less than its input force can still be usefui. give an example
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Answer:
First, you’ll be delighted to study Pascal’s Law, see Pascal's law - Wikipedia. It is such a general principle that it has countless applications.
Within a car, it’s the idea that when you step the break, perhaps with about 10s of Newton of force, you’re able to stop the car, because of a system that combines communicating vessels with Pascal’s law. As you step the break, the force is translated to a larger force in the area of the wheels affecting friction force to the braked pads and disks that is in the order of 100s of Newton of force.
Another age-old system is that of pulleys. As you pull on one end (or attach it somewhere), by a system of pulleys you’ll be able to pull up a weight equal to a multiple of your own. See Pulley - Wikipedia. Obviously your input (downward) force is less than the resulting upward force. Is this a machine? Well, you can apply these and other methods in machines. E.g., when you use a motor to lift a weight, and apply pulleys, you are basically talking about an elevator . . .