Describing rotation

Interactive lesson
Spotting circular motionInteractive lesson
Angular displacementInteractive lesson
The radianInteractive lesson
Converting angle unitsInteractive lesson
PeriodInteractive lesson
FrequencyInteractive lesson
Shorter period, more turns each secondInteractive lesson
Period and frequency are reciprocalsInteractive lesson
Swap period and frequencyInteractive lesson
Period from repeated timing

Angular velocity and the speed on the circle

Interactive lesson
Who sweeps angle faster?Interactive lesson
Angular velocityInteractive lesson
The angular velocity equationInteractive lesson
Calculate with the angular velocity definitionInteractive lesson
Angular velocity is not speedInteractive lesson
Bigger circle, faster moverInteractive lesson
Shorter period, faster moverInteractive lesson
The speed formula for circular motionInteractive lesson
Why the speed formula worksInteractive lesson
Calculate the speedInteractive lesson
Rearrange the speed formula

Uniform circular motion

Interactive lesson
Uniform circular motionInteractive lesson
Velocity points along the tangentInteractive lesson
Draw the velocity vectorInteractive lesson
Constant speed, changing velocityInteractive lesson
Circling means acceleratingInteractive lesson
Centripetal accelerationInteractive lesson
Why the acceleration points inwardInteractive lesson
Draw the acceleration vectorInteractive lesson
Read a circular-motion diagramInteractive lesson
Judge a flawed motion diagramInteractive lesson
What stays constant, what changesInteractive lesson
Faster around the same circleInteractive lesson
Tighter curve, bigger accelerationInteractive lesson
The centripetal acceleration formulaInteractive lesson
Calculate centripetal acceleration

Centripetal force

Interactive lesson
Newton's second law turned inwardInteractive lesson
Centripetal forceInteractive lesson
More mass, more force neededInteractive lesson
More speed, more force neededInteractive lesson
Tighter turn, more force neededInteractive lesson
The centripetal force formulaInteractive lesson
Calculate with the centripetal force formulaInteractive lesson
Solve for the speedInteractive lesson
Rank the required forcesInteractive lesson
Tension does the jobInteractive lesson
Friction does the job

Force suppliers, circular-motion analysis, and angular momentum

Interactive lesson
Gravity does the jobInteractive lesson
A surface's push does the jobInteractive lesson
Centripetal is a role, not a new forceInteractive lesson
Name the supplierInteractive lesson
Free-body diagram for circular motionInteractive lesson
Spot the bogus arrowInteractive lesson
When the inward force disappearsInteractive lesson
Why you feel flung outwardInteractive lesson
Full circular-motion analysisInteractive lesson
Can it hold the circle?Interactive lesson
Angular momentumInteractive lesson
Conservation of angular momentum