# 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.