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For example, a catapult that hits an object after it gets released from its initial position?

"the third class lever you can't touch it at the begining or end."

Just to make sure you understand, it is not that the lever cannot be touched, instead, the lever cannot touch the object at the start and at the end of the task.

hogger wrote:For example, a catapult that hits an object after it gets released from its initial position?

"the third class lever you can't touch it at the begining or end."

Just to make sure you understand, it is not that the lever cannot be touched, instead, the lever cannot touch the object at the start and at the end of the task.

The rule highlights the word Lift. By definition from dictionary.com

lift : to move or bring (something) upward from the ground or other support to a higher position; hoist.

By that definition it would seem lever used to launch an object upward to a higher position would be the same as lifting. Not sure how that would be interpreted and may need to be submitted for clarification.

Yes you are right, the lever must lift the object upward. Not sure what is needed to be clarified, it clearly states that the object must be lifted 15cm above where it starts. So the lever can't touch the object before and after, it must be lifted 15cm above where it starts, and then lastly, the final placement must cause the next action. The last one, I presume, the final placement is not necessary above where it starts, the object just has to at one point in the process be 15 cm above where it starts.

That does make sense now. I was having trouble with launch having the same meaning as lift. But the way the task is worded it doesn't matter how long the lever is in contact with the object being lifted. So it can be for only an instant to impact the object in order to lift it the required vertical distance.

What about designing gears and a using 3-D printer to create? designing them would make them homemade.

+mpcoach+ wrote:What about designing gears and a using 3-D printer to create? designing them would make them homemade.

Submit the question as an official clarification. This isn't an answer to your question, but I would point out that "designing" and "making" are two different processes.

can the gears be made of a buidding material such as kinex or legos?

i know that these are commercial brand products, but they don't make the gears themselves

any other gear suggestions would also be helpfull

Would a toilet lever be a type 3 lever? Any other examples of levers that could be incorporated would be greatly appreciated. I am coaching for the first time and engineering/physics is not my strong suit. Thanks!

tgaspar wrote:Would a toilet lever be a type 3 lever? Any other examples of levers that could be incorporated would be greatly appreciated. I am coaching for the first time and engineering/physics is not my strong suit. Thanks!

The wikipedia article on levers gives you a good summary of the different classes.
http://en.wikipedia.org/wiki/Lever

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Green is input, red is fulcrum, and output is the end of the lever. I think that a toilet lever is first, though.