Calculating Net Torque: An Example Problem with Formula and Image

Click For Summary
Net torque is calculated using the formula Tnet = F x r, where F represents the total force and r is the position vector from the center of rotation to the line of action of the force. The discussion highlights the importance of using the cross product of force and radius rather than simple multiplication to accurately determine torque. Participants emphasize the need for precision in defining the variables involved in the calculation. Misunderstandings about the definitions of force and radius can lead to incorrect results. Proper application of these concepts is crucial for accurate torque calculations.
dsptl
Messages
63
Reaction score
0
Last edited by a moderator:
Physics news on Phys.org
You're on the right lines, but you need to be careful here.

What is the definition of F and r?
 
F is the force and r is the radius
 
dsptl said:
F is the force
Good
dsptl said:
r is the radius
Not quite.
 
Hootenanny said:
Good

Not quite.

then?
 
dsptl said:
then?
It is the position vector directed from the centre of rotation to the line of action of the force. Another important point to realize is that you need to take the cross product of F and r, not simply multiply them.
 
Thread 'Correct statement about size of wire to produce larger extension'

Thread 'Correct statement about size of wire to produce larger extension'

The answer is (B) but I don't really understand why. Based on formula of Young Modulus: $$x=\frac{FL}{AE}$$ The second wire made of the same material so it means they have same Young Modulus. Larger extension means larger value of ##x## so to get larger value of ##x## we can increase ##F## and ##L## and decrease ##A## I am not sure whether there is change in ##F## for first and second wire so I will just assume ##F## does not change. It leaves (B) and (C) as possible options so why is (C)...
View full post »

Similar threads

Where on a rigid body is a resultant force applied?
  • · Replies 11 ·
Replies
11
Views
1K
Find the mass M so that the net torque is zero
  • · Replies 6 ·
Replies
6
Views
2K
Calculating Net Torque for an Inclined Wheel: A Problem in Applied Physics
  • · Replies 4 ·
Replies
4
Views
3K
Calculating Net Torque on Wheel Axle
  • · Replies 7 ·
Replies
7
Views
4K
Describe the angular momentum of the ball and net torque on
  • · Replies 7 ·
Replies
7
Views
2K
Torque and Net Force Calculations
  • · Replies 1 ·
Replies
1
Views
2K
Calculating the Force and Torque on a current loop
  • · Replies 3 ·
Replies
3
Views
4K
Proving that net torque isn't reliant on point of rotation.
  • · Replies 1 ·
Replies
1
Views
1K
Experimental Design: Pulley and Mass Hangers
  • · Replies 30 ·
2
Replies
30
Views
3K
Net angular acceleration of a two wheel system
  • · Replies 12 ·
Replies
12
Views
3K