torque and angular acceleration torque = = #nm -a force acting at a distance away from a pivot...

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Torque and Angular Acceleration -a force acting at a distance away from a pivot -causes a twist -torque is vector -direction is often Clockwise (CW) Counterclockwise (CCW) = F r or = I

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Page 1: Torque and Angular Acceleration Torque = = #Nm -a force acting at a distance away from a pivot -causes a twist -torque is vector -direction is often

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

Page 2: Torque and Angular Acceleration Torque = = #Nm -a force acting at a distance away from a pivot -causes a twist -torque is vector -direction is often

Torque and Angular Acceleration

Why is a door knob located as far as possible from the door hinge?

Page 3: Torque and Angular Acceleration Torque = = #Nm -a force acting at a distance away from a pivot -causes a twist -torque is vector -direction is often

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

Page 4: Torque and Angular Acceleration Torque = = #Nm -a force acting at a distance away from a pivot -causes a twist -torque is vector -direction is often

Torque and Angular Acceleration

Torque’s unit is Newton meters

-Units of energy1Nm = 1J

-Never use Joules as a unit for torque.

Page 5: Torque and Angular Acceleration Torque = = #Nm -a force acting at a distance away from a pivot -causes a twist -torque is vector -direction is often

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

Page 6: Torque and Angular Acceleration Torque = = #Nm -a force acting at a distance away from a pivot -causes a twist -torque is vector -direction is often

Torque and Angular Acceleration

Static EquilibriumTwo Conditions

-Forces must be balanced-Torques must be balanced

Page 7: Torque and Angular Acceleration Torque = = #Nm -a force acting at a distance away from a pivot -causes a twist -torque is vector -direction is often

Torque and Angular Acceleration

Static Equilibrium ScenarioTwo Forces are balanced

N

mg

Page 8: Torque and Angular Acceleration Torque = = #Nm -a force acting at a distance away from a pivot -causes a twist -torque is vector -direction is often

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

Page 9: Torque and Angular Acceleration Torque = = #Nm -a force acting at a distance away from a pivot -causes a twist -torque is vector -direction is often

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…

Page 10: Torque and Angular Acceleration Torque = = #Nm -a force acting at a distance away from a pivot -causes a twist -torque is vector -direction is often

Torque and Angular Acceleration

Ladder Example (Ladder is at rest)

Ground

Wall

Page 11: Torque and Angular Acceleration Torque = = #Nm -a force acting at a distance away from a pivot -causes a twist -torque is vector -direction is often

Torque and Angular Acceleration

Ladder Example (Ladder is at rest)

Ground

Wall

Page 12: Torque and Angular Acceleration Torque = = #Nm -a force acting at a distance away from a pivot -causes a twist -torque is vector -direction is often

Torque and Angular Acceleration

Ladder Example (Ladder is at rest)

Ground

Wall

Ff1

Ff2

N1

N2

mg

Page 13: Torque and Angular Acceleration Torque = = #Nm -a force acting at a distance away from a pivot -causes a twist -torque is vector -direction is often

Credits

Tunes by…

Guru

Page 14: Torque and Angular Acceleration Torque = = #Nm -a force acting at a distance away from a pivot -causes a twist -torque is vector -direction is often

Credits

Host

MC Webb

Funky Beats by…

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