Simple Machines B/Compound Machines C

[Sciolapedia]

Standard equation

(known mass + mass of hook hook if u have one) * (distance to known mass from fulcrum)
__________________________________________________________________________ minus mass of hook = mass of unknown.

(distance to unknown mass)

[FenderBender87]

Standard equation

(known mass + mass of hook hook if u have one) * (distance to known mass from fulcrum)
__________________________________________________________________________ minus mass of hook = mass of unknown.

(distance to unknown mass)

Thanks but two questions, why is the (distance to unknown mass just floating around out there? Did you mean:
Mass of unknown *distance to unknown mass? Also do you recommend hooks?

[Sciolapedia]

Standard equation

(known mass + mass of hook hook if u have one) * (distance to known mass from fulcrum)
__________________________________________________________________________ minus mass of hook = mass of unknown.

(distance to unknown mass)

Thanks but two questions, why is the (distance to unknown mass just floating around out there? Did you mean:
Mass of unknown *distance to unknown mass? Also do you recommend hooks?

First off, I HIGHLY recommend hooks. Its the easiest way to keep your mass on the lever without slipping and sliding. Oh, and make sure each of your hooks have the same mass. For your other question, Im not sure I understand what you meant. What do u mean by floating.

[FenderBender87]

Where should I put my hooks, at the far ends?

[Sciolapedia]

Ur hooks should be able to slide around the arm of the lever. Its not attached to a set region. To find the unknown mass, u must slide the hooks(one which is carrying known mass and one which is carrying unknown mass on other arm) till the lever is balanced. That is when u apply the equation I said.

That is my design at least there r numerous others that r possible.

[FenderBender87]

How would you instal the sliding hook? And by the way thanks SO much Schlopedia

[BSchiffer]

Can someone explain to me the ideal mechanical advantage of pulleys? Some sources say that it is the number of pulleys, others say the number of strings, and others say its one for a stationary and 2 for a moving. I feel like this shouldn't be this complicated so if someone could explain it to me I would be very grateful.

[hscmom]

How would you instal the sliding hook? And by the way thanks SO much Schlopedia

Find something that slips over the bar of your scale and glue/attach a hook to it. We dug around in the toy box and found a tube of some sort (I thought it was a plastic Tinker Toy piece but a quick Google search doesn't show it...) that worked just fine.

[hscmom]

Can someone explain to me the ideal mechanical advantage of pulleys? Some sources say that it is the number of pulleys, others say the number of strings, and others say its one for a stationary and 2 for a moving. I feel like this shouldn't be this complicated so if someone could explain it to me I would be very grateful.

For block and tackle systems, count the lines that are directly connected to the mass.

A stationary pulley only changes the direction of the pull. No mechanical advantage there.

A moving pulley gives mechanical advantage: you use less force but must pull the rope more. Youtube has some good videos and there are lots of websites and worksheets out there for practice.

[BSchiffer]

Thanks! One more question, for the lever, it says it must fit in a box 100x100x50 at impound, but does it have to actually be in a box? Or does it just have to theoretically fit?

Thanks again for everyone's help!!!