Physics - Recall for Chapter 16: Circular Motion

Flashcards

Angular velocity

What are the SI units of angular velocity?

angular-velocity-si-units-ch16

\[\text{rad s}^{-1}\]

What is the word definition of angular velocity?

angular-velocity-definition

The rate of change of angle.

How can you calculate angular velocity $\omega$ from $T$ or $f$?

angular-velocity-from-period-frequency

\[\omega = \frac{2\pi}{T} = 2\pi f\]

Centripetal force

What is required for uniform circular motion?

uniform-circular-motion-requirement

A force that always acts perpendicular to velocity.

Why doesn’t a centripetal force do any work on an object in circular motion?

centripetal-force-does-no-work

The force is perpendicular to the motion.

Linear velocity

How can you calculate the linear velocity $v$ from the time period $T$ for an object in circular motion?

linear-velocity-from-period

\[v = \frac{2\pi r}{T}\]

How can you calculate linear velocity $v$ from angular velocity $\omega$?

linear-velocity-from-angular-velocity

\[v = \omega r\]

What is the direction of velocity of an object travelling in a circle at constant speed?

velocity-direction-tangent

At the tangent to the circle it’s moving along.

Sources of centripetal force

What provides the centripetal force for a car turning a corner?

car-corner-centripetal-friction

Friction from the road on the tyres.

What provides the centripetal force on the moon?

moon-centripetal-gravity

The gravitational attraction of the Earth.

What is the name for the resultant force on an object in circular motion?

resultant-force-name-centripetal

Centripetal force.

Tension in a vertical circle

If a mass on a string is swung in a vertical circle, where is the tension the greatest?

vertical-circle-max-tension-bottom

At the bottom of the circle.

If a mass on a string is swung in a vertical circle, where is tension the least?

vertical-circle-min-tension-top

At the top of the circle.