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Bruce Mayer, PE Licensed Electrical & Mechanical Engineer [email protected]

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Engineering 25. Tutorial: Flat Friction. Bruce Mayer, PE Licensed Electrical & Mechanical Engineer [email protected] Spring-n- Wts on Ramp.

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Engineering 25

Tutorial: FlatFriction

Bruce Mayer, PE

Licensed Electrical & Mechanical [email protected]

spring n wts on ramp
Spring-n-Wts on Ramp
  • Two blocks A and B have a weight of 10 lb and 6 lb, respectively. They are resting on the incline for which the coefficients of static friction are µA = 15% and µB = 25%. Determine the incline angle for which both blocks begin to slide. Also find the required stretch or compression in the connecting spring for this to occur. The spring has a stiffness of k = 2 lb/ft.
conceptual analysis
Conceptual Analysis
  • Since Block-A has the lower µS value, it will Slide FIRST, thereby PULLING Block-B Down the ramp with it
  • Thus expect the Dual-Block Slip-Angle
  • Take the FBD of both Blocks noting that the Spring Force, FS, will be equal & opposite for both blocks
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