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Transcript of Simple Machines
A screw cuts through an object. Often we think of screw when building. We use a tiny screw that has an inclined plane wrapped around a cylinder with a sharp edge at the end. When you press and turn the screw it will go further into the object and fasten that object to a surface or
A lever can be used to pry something open or lift something up. A lever has an object on one side resting on a point, called a fulcrum, and on
An inclined plane is a plane or a flat surface that is slanted upward. It connects a lower surface to a higher one. You can move loads by sliding it across the plane to that surface. It can also be called a ramp. Some examples of an inclined plane could include sliding a heavy box up onto a truck rather than lifting it, or walking up a ramp to get to a ledge rather than jumping. A disabled person might use an inclined plane to get into a car.
- Inclined Plane
-Wheel and Axle
Wheel and Axle
There are 6 simple machines.
What is a
A machine is something that makes life easier. For example, a vacuum is a machine. It makes cleaning easier. Simple machines not only make life easier, but are also simple in handling and using. For example, stairs - a type of inclined plane - is much easier to handle and use than a vacuum.
A wedge is an inclined plane, but instead of using the flat side you use the pointed edge to spread one thing into two by pressing further and further into the object. One example might be cutting down a tree. You're going to spread apart two parts from the tree. Another example is slicing bread. It could also be a zipper.
the other side you can apply weight or force to balance it. If an object moves closer to the fulcrum, it becomes easier to lift. An example would be a teeter-totter; push on one side, the other comes up. Or digging out a weed with a shovel. When you push down on the handle the weed will come up. Or even the end of a hammer to dig out screws.
The wheel and axle has a very flat cylinder with a hole in the middle called a wheel. To fill that hole there is a very skinny cylinder called an axle. Often there are two wheels attached to one axle. Turn the wheels and they'll roll. The axle will will keep them from going off and keep them straight. Some examples are the wheels on a car, a steering wheel, or even a doorknob.
Now take a wheel and wrap a cord around it. Attach a hooked load to one end of the cord. And by pulling the opposite end of the cord you can raise and lower the load. The cord will spin the wheel which makes it easier to pull. What does this all add up to? A pulley, that's what! A flagpole has a pulley. Window blinds also have a pulley. Just like the reel on a fishing pole.
another object. You could also have the inclined plane wrapped around the inside of a hollow cylinder that fastens from the outside. But a helicopter propeller cuts through air to fly the helicopter. Same with a boat propeller only it cuts through water. One example is putting a screw into two pieces of wood to make it hold together. Some others might be a bottle cap or swivel piano stool.