IC2.1-twopulleys-1

# IC2.1-twopulleys-1 - the 40 lb block is twice that of the...

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Determine the vertical acceleration of the 60lb block for each of the two cases. Neglect friction and the mass of the pulleys. 3/24 Do system (a) first. You can draw the FBD of the pulley too if it helps. ma y T T 2T The FBD and MAD diagrams for the 60 lb block is the same as for (a) and… ma 2y Do out the equation of motion +y FBD and MAD for 40 lb block: 1 2 2 2 How do you relate a 1y and a 2y ? +y Look at how we set up our axes – when 1 goes up +y for that block), 2 goes down (-y for that block). Write the equation of motion : 2 equations, 2 unknowns. Solve 1 Remember from pulley stuff, the displacement of

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Unformatted text preview: the 40 lb block is twice that of the 60 lb block. http://science.howstuffworks.com/pulley.htm You can check out the link below for more info: 1 See next page for algebra If you get the dynamic equations correct, then you will get most of the points for a problem. The algebra follows below. First we’ll do the substitution metho – solve the equation below for T: 1 Sub into other equation Crunch the numbers For linear addition method, multiply the second equation by -2 and add: Add this equation to this equation and get this equation Crunch the numbers...
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IC2.1-twopulleys-1 - the 40 lb block is twice that of the...

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