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16. Friction (General)

# 16. Friction (General) - ME 270 Basic Mechanics I Group...

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Unformatted text preview: ME 270 - Basic Mechanics I - Group Quiz Name/Group #: __—_____.___ Group Members: 1) Date:__.___.___ Period: _.______ 3) Given: The hydraulic cylinder exerts a force to the right on a brake arm at point B. This brings the brake shoe into contact with a turning wheel, in order to stop it by friction. While the wheel is not in equilibrium (indeed, it is being decelerated), the armis. Find: (a) Find the ratio of the normal force between the shoe and the wheel to the force exerted by the hydraulic cylinders if the wheel rotates clockwise. Neglect the weights of the arm and shoe. (b) Repeat part (a) assuming the wheel rotates counter clockwise. Would the clockwise or counterclock- wise wheel brake faster? Why? (c) As a design engineer, if you were asked whether it would be desirable to change the vertical location of the hydraulic cylinder would you recommend? mot 2) 4) 30 cm Hvdraulic 40 cm cylinder J‘ Friction coefﬁcient = 0.4 (a) Z M.” =0 =~ —- o Maj—a. 7w) 191230.?) \ w...“ “145mm m? 516/70»? oi Ha ﬁnkaﬁlmgafﬂéﬁbl L. 041(Bx) (07+ OBAQ/V N/g "‘ @ZMA= O" -- "O 4(523 +0.7 (N)” ”0 3&5) Jsscuwna, \$321347 4:6 7%. £r¢kz§hoa9f7ﬁxﬂ J 361452) (0 7 org/«DIV 07+03/4k " a) 5% Wﬂﬁﬁg ;______ncgsm_rg_iz.>_,oroda m ‘ . ...
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16. Friction (General) - ME 270 Basic Mechanics I Group...

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