Torque and Angular Acceleration Torque = = #Nm -a force acting at a distance away from a pivot...
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Transcript of Torque and Angular Acceleration Torque = = #Nm -a force acting at a distance away from a pivot...
Torque and Angular AccelerationTorque = = #Nm
-a force acting at a distance away from a pivot
-causes a twist-torque is vector
-direction is oftenClockwise (CW)Counterclockwise (CCW)
= F r or = I
Torque and Angular Acceleration
Why is a door knob located as far as possible from the door hinge?
Torque and Angular Acceleration
Why is a door knob located as far as possible from the door hinge?
-You increase the “lever arm”
Hinge
Doorknob
Torque and Angular Acceleration
Torque’s unit is Newton meters
-Units of energy1Nm = 1J
-Never use Joules as a unit for torque.
Torque and Angular Acceleration
Newton’s First Law (revisited)-An object at rest will remain at rest, an object rotating will remain rotating, unless acted upon by an unbalanced outside torque
Torque and Angular Acceleration
Static EquilibriumTwo Conditions
-Forces must be balanced-Torques must be balanced
Torque and Angular Acceleration
Static Equilibrium ScenarioTwo Forces are balanced
N
mg
Torque and Angular Acceleration
Static Equilibrium ScenarioTwo Torques are balanced
Mass 1= 50 gramsRadius 1 = 10 cm Mass 2= 100 grams
Radius 2 = 5 cm
H:\IP Sims\Rotational Dynamics\Net Torque Example.IP
Torque and Angular Acceleration
Let’s look at an example where torques are not balanced
Click here…
Torque and Angular Acceleration
Ladder Example (Ladder is at rest)
Ground
Wall
Torque and Angular Acceleration
Ladder Example (Ladder is at rest)
Ground
Wall
Torque and Angular Acceleration
Ladder Example (Ladder is at rest)
Ground
Wall
Ff1
Ff2
N1
N2
mg
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