Calculations for force, Mechanical Engineering

Calculations for force:

A square block having 25cm side and weighing 20N is hinged at point A and rests on rollers at point B as shown in the figure given below. It is pulled by string attached at point C and inclined at 300 with horizontal. Make calculations for force P to be applied so that block gets lifted off the roller only.

687_Calculations for force.png

Sol.: From Free body diagram the block is subjected to following set of forces.

1. Force P

2. Weight of block W

3. Reaction RA  at hinged point

4. When block is at the state of being lifted off the roller only, reaction RB  = 0

∑MA = 0

- Pcos30° × 0.25 - Psin30° × 0.25 + 20 × 0.125 = 0

- 0.22 P - 0.125P + 2.5 = 0

P = 7.27N                               .......ANS

Posted Date: 10/17/2012 5:07:52 AM | Location : United States







Related Discussions:- Calculations for force, Assignment Help, Ask Question on Calculations for force, Get Answer, Expert's Help, Calculations for force Discussions

Write discussion on Calculations for force
Your posts are moderated
Related Questions
Matter, particle and body: Matter is anything which occupies space, possesses mass provides resistance to any stress, example Iron, air, stone, Water. A body of negligible

Q. What is the use of welding electrode? An electrode is a piece of wire or a rod (of a metal or alloy), with or without flux covering, which carries current for welding. Its o

advantages and disadvantages of hot working

Illustrate theories in planning a machining sequence A component requires several machining operations to bring it to a final shape. The sequence of these operations are arran

Compute the force in the rod: A rod ABC rotating at 20 rpm about a vertical axis through A, supports a ball of mass 10 kg at its lower end. It is fixed in position by the rod

Determine the reactions at the supports: A smooth sphere weighing 200 N is resting as shown in Figure. Determine the reactions at the supports. Solution Let us fir

wire-frame entities-representing ellipse and parabolas


A cantilever of length 2m carries a uniformly distributed load of 1.5 KN/m run over the whole length and appoint load of 2KN at a distance of 0.5 from the free end draw the Shear

I have homework needs to be solved anyone able to help there ?