Torque

1
Torque
2
Angular Speed

• Angular speed is represented by ? which is the
  lower case Greek symbol called omega
• ?v/r
• Centripetal acceleration can also be
• ac (?r)2
• Fcmr?2

r
3
Torque

• Lever arm or moment arm is the perpendicular
  distance from the axis of rotation to the line
  along which the force acts
• Torque is the moment of force about the axis or
  the force times the lever arm

4
Torque

• Torque is represented by t the lower case Greek
  letter tau
• tr F sinT

5
Example

• If the torque required to loosen a nut holding a
  wheel on a car is 91 Nm, what force must be
  exerted on the end of a .19m lug wrench to loosen
  the nut when the angle is 49º?

6
Solution

• t r FsinT
• Ft/(r sinT)
• F91 Nm/.19 sin49
• 634 N