Machines Flashcards
How do levers work
Machines work by 3 different inputs, force , load and effort which all have different placements on the machine
What was one of the ancient machines and who made it
Archimedes made many such as the cannon pult, the drill and the sewage system
What was one of the ancient machines and who made it
Archimedes made many such as the cannon pult, the drill and the sewage system
How do gears work
Gears work by spinning the teethed circle called the driver which spins the driven second gear , the ratio of teeth tells us the mechanical advantage e.g. the larger the driver the faster it will be or if it’s smaller the more force it will generate
How do pulleys work
Pulleys work by using a mechanical advantage which consists of a wheel with a groove in the middle which allows a rope or chord to go in the middle and allows it to be pulled
How can pulleys change force
A single pulley changes the direction of force, making pulling down easier than lifting up. Single pulley systems are demonstrated in cranes, lifting a bucket from a well, raising a flag or adjusting window blinds. Even though there is no actual mechanical advantage with one pulley, it is referred to as having a mechanical advantage of one.
What are pulleys used for mostly
Pulleys are a simple and manoeuvrable way to move large objects. They are easy to transport to where they are needed and set up, but they do require somewhere stable to hang.
What did archimedes mean by a long enough lever could lift the earth in terms of effort and load
Using a longer lever minimises the required load force
How can we calculate moments or turning forces
Moment = force x distance
Force = moment / distance
Distance = moment / force
What are the many types of gears
Helical gears, spur gears , worm gears, bevel gears and sprocket gears
What 2 things can a gear system change
Gear systems can change speed and direction
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