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August 2nd, 2019, 01:10 PM   #11
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Quote:
 Originally Posted by helpmeddddd The torque on the 2500N (far right of the diagram) should be 2500Nm ( I used the 1m for distance in the equation)
ok

Quote:
 The torque for 1500N (IN the middle of diagram) I got 3000Nm(I used the 2m measurement)
No ... how far is the 1500N force from the $\color{red}{\text{pivot point}}$?

Quote:
 The torque for F is? ( I'd use 3m for distance)
the torque is F times 3.

Now finish it ...

 August 2nd, 2019, 02:04 PM #12 Global Moderator   Joined: Dec 2006 Posts: 20,921 Thanks: 2203 The wording of the question seems incorrect. Stating "Without the force F the platform is just about to tip." is different from stating "Without the force F the platform would tip." The wording used suggests that any non-zero downward force F would suffice to prevent tipping. However, that wouldn't be the case if the distances and other forces shown are correct. The suggested answer process would calculate the value of F such that the platform is precisely balanced with that force applied. However, this equilibrium wouldn't be stable.
 August 3rd, 2019, 06:15 PM #13 Senior Member   Joined: Mar 2019 From: TTF area Posts: 106 Thanks: 1 So for 1500N it's actually 1m so = 1500Nm And what do you mean "F times 3"? Do I add up all the forces I've calculated? Last edited by skipjack; August 4th, 2019 at 07:18 PM.
 August 4th, 2019, 02:37 PM #14 Senior Member   Joined: Mar 2019 From: TTF area Posts: 106 Thanks: 1 My working: T=fxd T(for force 2500N) = 2500x1= 2500Nm, (torque for force bridge downwards 1500N) =1500x1=1500Nm sum up both torques 2500-1500=1000Nm (solve for unknown weight F) Fx3 F=1000/3= 333N?
 August 5th, 2019, 02:21 PM #15 Senior Member   Joined: Mar 2019 From: TTF area Posts: 106 Thanks: 1 or(2500x1)+(1500x1)=3f 2500+1500=3f 4000=3f f=4000/3 f=1333N? I'd really like to know how I'm going wrong. If I am. @skeeter Last edited by helpmeddddd; August 5th, 2019 at 02:34 PM.
 August 6th, 2019, 12:04 AM #16 Senior Member   Joined: Apr 2014 From: UK Posts: 953 Thanks: 340 Your previous answer (333N) is correct.

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