14-15 Kinetics of a Particle: Work and Energy | Chapter 14: Hibbeler Dynamics | Engineers Academy

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Chapter 14: Kinetics of a Particle : Work and Energy
Hibbeler Dynamics 14th ed

14–15. The two blocks A and B have weights WA = 60 lb and WB = 10 lb. If the kinetic coefficient of friction between the incline and block A is uk = 0.2, determine the speed of A after it moves 3 ft down the plane starting from rest. Neglect the mass of the cord and pulleys.

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Комментарии
Автор

This process is correct except for neglecting tension from the hook to A's pulley. This tension is doing the same work block B is. To get the right answer, multiply the work done by B by 2.

emptytrench
Автор

when you substituted SB into the equation, why did you remove the negative sign and did not include it? Thanks

tasneemrka
Автор

why isn't the work done by gravity on bock A, the height traversed in 3 feet down the incline, ie., 3 sine 60?

rk
Автор

Why don't you consider the tension for the work in a?

Papeye