Transcript Torque101.pptx

Torque
Torque
• Torque is a twisting force. The
length of the wrench matters.
• Torque =
Force x Lever Arm
• Suppose we exert
40 pounds on a
9 inch wrench
• T = F x d = 360 inch∙pounds
• In English this is written
360 inch-pounds
Converting Torque Units
• The most common unit of torque in the U.S. is
the foot-pound.
• Convert 360 inch-pounds to foot-pounds.
• 360 inch⋅pounds
1 foot
1
12 inches
•
= 30 pounds ⋅ feet = 30 foot-pounds
Converting Metric
• Convert 60 gram⋅cm (lab unit of torque)
to kilogram⋅meters
• 60 gram⋅cm 10-2 meter
kilogram
1
centimeter 103 grams
• = 60 x 10-2 x 10-3 meter⋅kilograms
• = 60 x 10-5 kilogram⋅meters
• = 6.0 x 10-4 kg-meters = .0006 kg-m
A Lever is Balanced When the Torques
are Equal
• Torque on Left
• F1 ⋅ d1
=
• No Ratios
=
Torque on Right
F2 ⋅ d2