The mass of the bar shouldn't prevent you from your results. Is it at equilibrium before putting masses on? If not, then get it there! Use a counterbalancing mass.I understand that, but the problem is that the ratio between d1 and d2 is that the mass of the bar prevents finding an equal ratio. I've tried tests with 2 known masses, and I found measurements to create equilibrium with 2 200g masses, but not 2 20g masses. Does anybody else know how to figure out the ratios? Thanks.
Expanding on what you've said for compound machines.(And apologies for ms paint)For everyone asking about how to do the ratio:
You do not require a mass to determine the ratio. Instead, you can derive the ratio by setting the torques of each side of the lever equal to each other such that τ(1)=τ(2). Then, rmgsinΘ=rmgsinΘ, and simplification yields r(1)m(1)=r(2)m(2), which can be rearranged to r(1)/r(2)=m(2)/m(1), where r(1) is the distance mass A is away from the fulcrum and r(2) is the distance mass B is away from the fulcrum. Simplifying r(1)/r(2) so the denominator equals 1 will yield the ratio m(2):m(1), and no further calculation is necessary.
From my experience last year in simple machines:For all of you in Simple Machines, what are some of the harder problems you've encountered? It seems that the rules make the event so limited in terms of scope, and I'm wondering what I should study.
At Dodgen Invitational we had some very difficult problems involving levers with multiple balance points and masses of parts of the machine. The hardest I've seen in Div B are slightly under the level of Fizix's Div C test on the test exchange.From my experience last year in simple machines:For all of you in Simple Machines, what are some of the harder problems you've encountered? It seems that the rules make the event so limited in terms of scope, and I'm wondering what I should study.
Being able to take an object and figure out ALL simple machines that are in it.
For example, take a bicycle: you have the wheels (wheel/axle), the gear chains (pulley), lever (handlebars), etc.
Make sure that you are able to solve basic questions about Work, Energy, forces, etc.
Also history of simple machines. Make sure to read up on that.
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