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Section 8-1; Torque

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Mackenzie Webster

on 7 April 2011

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Transcript of Section 8-1; Torque

Torque
Moment of force, tendancy of a force to rotate an object about an axis Torque is the moment or moment of force; the tendancy of a force to rotate an object around an axis Magnitude of a torque because of the absence of friction, the acceleration due to gravity is the same for all abjects near the Earth's surface Differences... Point mass = motion of an object described by assuming

Extended objects = definte shape and size

Difference = Extended objects have a more sophisticated model to describe it's rotaional motion Rotational and translational motion can be separated and analyzed individually Net Torque Produces rotation
ability of a force to rotate an object around some axis and is measured by the quantity of torque Levers torque depends on a force and a lever arm How easily an object rotates depends not only on how much force is applied but also where it is applied the farther the force is from the axis of rotation, the easier it is to rotate the object and the more torque is produced lever arm (movement arm) = perpendicular distance from the axis of rotation Torque also depends on the angle between a force and a lever arm Sign of a Torque To determine the sign of a torque, visualize the direction the object would rotate.
counterclockwise- positive
clockwise- negative

If more than one force, they must be treated separately. SAMPLE PROBLEM A basketball is being pushed by two players during tip-off. One player exerts a downward force of 11 N at a distance of 7.0 cm from hwe axisof rotation. The second player applies an upward force of 15 N at a perpendicular distance of 14 cm from the axis of rotation. Find the net torque acting in the ball. 8-1 Section Objectives: recognize the differnce between a point mass and an extended object?
an extended object is a more sophisticated model to describe its rotational motion Distinguish between torque and force?
Torque: ability of a force to rotate an object around some axis
Force:The capacity to do work or cause physical change; energy, strength, or active power Calculate the magnitude of a torque of an object: see sample problem Identify the lever arm associated with a torque on an object?
example: a cat door; the door being pushed by force is the lever arm in association torque
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