Save a Life Lab

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Are  lab was successful because we put all the weigh on his head and we put it on each side of the head so the weight would be balanced out and we put it on his head so the the could float. Something that could be improved is try to make his feet float a little and also his head a little more too. The life jacket increases the man’s volume so he can float.

Simple Machines

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Simple Machines are machines made to make work easier. Work is defined Force * Distance.  Machines change the distance (speed) at which resistance moves which gives an advantage for distance.  They also change the size of force needed  which gives force an advantage. They also change the direction of the force applied which gives an advantage for direction. The different types of simple machines are levers, pulleys, wheel and axles,wedges,  and inclined planes. A lever is used to lift a load with a certain amount of force from the other side. The components  to a lever is an effort arm,  resistance arm, and a fulcrum.  There are three types of levers. The first kind of lever is called a first class lever. That is when the fulcrum is positioned in the middle of the effort arm and resistance arm. The second kind of lever is called a second class lever. This is where the fulcrum is placed at one end and the effort arm is placed at another. And the resistance arm (load) is somewhere in between. The third type of lever is called a third class lever. It is where the fulcrum is placed at one end and then what is different is the effort arm and resistance arm (load) just switch places. In levers if you increase the distance that the force is exerted you are willing to decreases the amount of force that you apply. A pulleys work as changing the direction of the effort force and letting you use your bodies weight to support that effort force. In a pulley you have a effort force which is you pulling, an load which is the thing you are lifting. And a fixed support which is the pulley. The  wheel and axle is actually a rotating lever the rotates around a fixed point in the middle called a fulcrum. And the rod that is connected to the wheel is the axle. And inclined plane like a ramp increases the distance but it doesn’t require that much effort as if you skipped the ramp and jumped to get to the ledge and that requires more effort and you will get tired if you keep doing that but you will never get tired if you use the ramp because it doesn’t require barley any effort. A wedge is used for spiting two things apart. A wedge is pretty much two inclined planes that come together and met and form and fixed point in the front.

An example of of a first class lever is a see-saw because the fulcrum is in the middle. An example of a second class lever is a wheel barrow because the resistance arm (load) is closer to the fulcrum and the effort is spread out which makes it easier to lift. An example of a third class lever is tweezers. Some examples of pulleys are blinds, crane, and  the chains on a bike. Some examples of wheel and axles are a door nob, car tire that has the metal rod in the middle of the tire, and a ferris wheel. How those are all examples is because they all have a point that they are rotating around and a axle attached to the wheel which makes it rotate. Examples of inclined planes are ramps, screw, and a escalator. I said screw because if you unravel a screw it is really just a ramp going down and a escalator is one because it is basically a ramp going up except it has moving stairs. Examples of some wedges are axes, shovels, knife, and fork. You might be confused why I said fork but if you think about it each little sharp point that a fork has is a wedge.

I thought the Rube Goldberg project that the class did was pretty good. My favorite piece was I like how one group incorporated a car track that made the car get enough speed to hit the wooden block or whatever it was. My group made the last part where the weight came down and hit the easy button. I thought the class did very well on it.