The placement of the fulcrum is very important for the mechanical advantage of the lever. Most of the time it seemed to work much better if it was farther away from you. The relationship between the input and output distance was inverse, (or opposite)
Inclined planes are very effecient, if very long. The longer plane was the easiest to work with. Other factors would have to be weight of the object, strength of the person, how high you have to push it, or friction!
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