My Math Forum  

Go Back   My Math Forum > Science Forums > Physics

Physics Physics Forum


Thanks Tree3Thanks
Reply
 
LinkBack Thread Tools Display Modes
August 2nd, 2019, 01:10 PM   #11
Math Team
 
skeeter's Avatar
 
Joined: Jul 2011
From: Texas

Posts: 3,002
Thanks: 1587

Quote:
Originally Posted by helpmeddddd View Post
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 ...
skeeter is offline  
 
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.
skipjack is online now  
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.
helpmeddddd is offline  
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?
helpmeddddd is offline  
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.
helpmeddddd is offline  
August 6th, 2019, 12:04 AM   #16
Senior Member
 
Joined: Apr 2014
From: UK

Posts: 953
Thanks: 340

Your previous answer (333N) is correct.
weirddave is offline  
Reply

  My Math Forum > Science Forums > Physics

Tags
weight



Thread Tools
Display Modes


Similar Threads
Thread Thread Starter Forum Replies Last Post
help with weight mschoer Elementary Math 6 April 8th, 2014 08:15 AM
What is it weight? Chikis Physics 6 September 8th, 2012 04:49 PM
Computing the weight. eila025_meys Algebra 3 May 12th, 2012 06:26 AM





Copyright © 2019 My Math Forum. All rights reserved.