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More than one kind of speed…
Linear speed (velocity) Distance time Greater for outside horse AKA tangential speed
Rotational speed (velocity) # of rotations per unit of time Same for all horses AKA angular speed
Washer on a string…
The washer’s speed does not change, but its velocity does Centripetal acceleration
Let’s pretend...
You need to loosen a stuck bolt with a wrench...
You aren’t strong enough...what do you do?
Torque
Produces rotation
= Fr Long arm, less force More force, shorter arm
Ex. wrench, screwdriver, doorknob
Rotational Inertia
Resistance to change in rotational motion
Greater distance from center of mass to rotation point = greater inertia
Why do baseball players “choke up” on the bat?
“Choking up” on a baseball bat will increase speed of swing