Question

Which of the following simple machines do you feel has had the greatest impact on humans: the inclined plane, the lever, or the wheel and axle? Explain your answer.

Answer 1

Explanation:

Aloha !

A wheel used for transportation from one place to another place.

Happy to answer you

Answer 2

Answer:

Levers

A lever is the simplest machine of all: it's just a long bar that helps you exert a bigger force when you turn it. When you sit on a see-saw, you've probably figured out that you need to sit further from the balance point (known as the pivot point or fulcrum) if the person at the opposite end is heavier than you. The further away from the fulcrum you sit, the more you can multiply the force of your weight. If you sit a long way from the fulcrum, you can even lift a much heavier person sitting at the other end—providing they sit very close to the fulcrum on their side. The force you apply with your weight is called the effort. Thanks to the fulcrum, it produces a bigger force to lift the load (the weight of the other person). The words "effort" and "load" can be very confusing, so we've avoided using them in this article. The important thing to remember about levers is that the force you produce is bigger than the force you apply

With a long lever, you can exert a lot of leverage. When you use an axe or a wrench, the long handle helps to magnify the force you can apply. The longer the handle, the more leverage you get. So a long-handled wrench is always easier to use than a short-handled one. And if you can't budge a nut or bolt with a short wrench, try one with a longer handle.

Wheels and axles

The invention of the wheel and axle (the rod around which a wheel turns), around 5500 years ago in the Middle East, revolutionized transportation and gradually brought huge changes to society, but what made it so special? It's easier to push a cart loaded with a heavy box than to push the same box along the ground because the cart's wheels and axles reduce friction and provide leverage

Big wheels are used to multiply force in other ways too. Pipes, for example, have wheels called stopcocks (or stop valves) fitted to them. When you turn the outer rim of a stopcock, the inner axle turns with much greater force—so the pipe is easier to close. Steering wheels work this way too. A truck or a bus often has a bigger steering wheel than a car, because it takes more force to turn its wheels. The bigger wheel gives the driver more leverage.

Wheels can multiply distance and speed as well as force. Bicycles have large wheels so they go faster. When you pedal, you power the inside of the wheel. But the wheel's outer rim turns around faster and covers more ground, so your pedaling has a much greater effect. Car wheels work the same way.

Wheelbarrows combine wheels and levers to brilliant effect. A wheelbarrow makes it really easy to transport a load from one place to another—for two reasons. First, its long frame acts like a lever, so the load is much easier to lift. Second, it's easier to push the load using a wheelbarrow because the only friction is between the wheel and the axle. If you pushed the load across the rough surface of the ground without using a wheelbarrow, the friction would be much greater

hope it helps you......

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