Physics Help Forum Cancel reaction force

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 Jan 10th 2018, 06:23 PM #1 Junior Member   Join Date: Feb 2017 Posts: 7 Cancel reaction force This triangular moves along the x axes. It is in equilibrium as the spring force Fx=100N from the right is canceled by the reaction on the wall. A roller which moves only along the y axes applies force Fy. Angle θ=25 degrees. No friction, no gravity. How much force Fy is needed in order to cancel the reaction on the wall? Could I say that Fy*sin25=100--->Fy=100/sin25=236N? Attached Thumbnails     Last edited by cxz; Jan 11th 2018 at 07:26 AM.
 Jan 10th 2018, 10:25 PM #2 Senior Member   Join Date: Apr 2017 Posts: 154 Yes ... that looks correct to me.
 Jan 11th 2018, 07:27 AM #3 Junior Member   Join Date: Feb 2017 Posts: 7 I think I have made a mistake. There must be an Fx and an Fy reaction to the 100N Please see my new picture above. Could you please check my new calculations? Thanks
 Jan 11th 2018, 04:05 PM #4 Senior Member   Join Date: Apr 2017 Posts: 154 No ...I think you were right the first time ... The question says the triangle is in equilibrium . the force from the spring is 100N , so this is the horizontal component of Fy so Fy sin 25 =100 You don't need to be concerned about the vertical component felt by the triangle from Fy ... it will always be balanced by the two rollers pushing up. Last edited by oz93666; Jan 11th 2018 at 04:12 PM.

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