Question

Hi I'm rex. This is my first day here. I'm still confuse on rotational/circular motion? can anyone help me please?

Answer 1

Do you have a specific question?

Answer 2

Rotational Motion is for Point-Objects (which cover a large distance relative to their mass in a given time) and Circular Motion is for large objects, like us, a ball, the swing of a tennis racquet etc

Answer 3

The magnitude of the force required to keep an object going in a circle at constant velocity is given by the following expression.\[F = \frac{mv^2}{r} \]The force is always directed towards the center of the circle. If you want a derivation of that expression or want help with any examples, give me a holler.

Answer 4

Rotational kinematics come from circular motion (objects moving in a circle). There are rotational analogs to the linear equations and variables. For instance these are some analogous variables.
\[a = \alpha\]
\[v = \omega\]
rotational kinematics are used because they make problems with rotating objects much easier. For instance if you want to know the velocity of a spinning disk in terms of linear kinematics the velocity changes depending on what location on the disk you are looking at whereas the rotational analog \[\omega\] is constant for the entire disk.