**Rotational and Tangential Velocity**

When something
spins it has two velocities a tangential velocity and a rotational velocity. The
rotational velocity is how fast the rotation of the object is who many times
the object rotates in the allotted time. The inner rotation rotates at the same
seep that the outer does. The tangential velocity is the strait velocity, that
is the velocity that moves only forward. The inner tangential velocity moves
slower than the outer tangential velocity.

**Rotational Inertia**

The harder it
is to spin the more rotational inertia the object has. The axis of rotation is
where the object spins and the closer the mass is to the axis the easier it is
for the object to spin. As well the farther the mass is from the axis of rotation
the harder it is to rotate the object. When it is hard to rotate it has a high
rotational inertia and if it is easy to spin it has a small rotational inertia.

**Conservation of angular momentum**

This is the
same principle as the conservation of momentum but with rotating objects. The property
states that the momentum before is the same as the momentum after. The formula
is P=rotational velocity * rotational inertia. One can regulate the inertia and
by consequence the velocity will increase or decrease depending on if you increase
the inertia or decrease it.

**Torque**

Torque is the
force that causes things to rotate. Torque is made of a force and a lever arm
(T=F*Lever Arm). When an item is balanced the counterclockwise and clockwise
torque are equal.

**Center of Mass/Gravity**

The center of
mass/gravity is where the force to an object is applied. As long as the center
is over the base of support of the object it will not fall over. The lower the
center is the harder it is to tip the object and the wider the base of support
the harder it is to tip over.

**Centripetal/Centrifugal Force**

Centrifugal
force is made up, it does not exist. The only force acting is the centripetal
force which is the force that pulls objects into the center. This force can be
the combination of gravity and tension or support, or a wall pushing the object
to the center.

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