Torque - PowerPoint PPT Presentation

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Torque

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Title: Force, Torque and Equilibrium Author: Administrator Last modified by: horlorm Created Date: 4/4/2004 7:27:55 PM Document presentation format – PowerPoint PPT presentation

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Title: Torque


1
Torque
  • A turning force

2
Torque (T) a turning force
  • Torque depends on the linear force applied and
    the distance from the fulcrum (pivot point)
  • Eg pushing a door is harder from near the hinge
    than near the handle

3
Torque is a vector
  • Because it is a turning force, the direction is
    given as clockwise or anticlockwise
  • T Fd so the units are Nm

4
Common examples of torques are levers, seesaws
and bridges
  • The best approach to finding total torque is to
    find the clockwise torques and balance against
    the anti clockwise ones

5
Force, Torque and Equilibrium
  • When an object is at rest or moving uniformly it
    is said to be in equilibrium

6
Forces and Equilibrium
  • 2 forces are in equilibrium if they are equal and
    opposite
  • 3 forces are in equilibrium if their vector sum
    0 (a closed triangle)
  • Any number of forces are in equilibrium if they
    form a closed vector diagram

7
A torque needs
  • A name turning force or torque
  • A pivot point fulcrum
  • A size for the force and the perpendicular
    distance from the fulcrum
  • A formula T Fd (units Nm)
  • A direction clockwise or anticlockwise direction

8
Solving torque problems
  • Draw a diagram
  • Find and sum the clockwise Torques (Tc)
  • Find and sum the anti-clockwise Torques (TA)
  • Equilibrium exist if the TA Tc

9
To be in equilibrium
  • The forces must be balanced
  • The torques must be balanced!
  • If the torques are unbalanced then there is a
    total force (also called net force) and
    acceleration happens. The system is not in
    equilibrium.
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