An object with mass M is in uniform circular motion with radius R and speed V.
What is the total energy of the object?

Question

An object with mass M is in uniform circular motion with radius R and speed V.
What is the total energy of the object?

kewlgeek555 · Answer

This is the equation for calculating Kinetic Energy:$$KE=0.5 \times mv ^{2}$$Where KE is the total kinetic energy, m is the total mass, and v is the total velocity.
Please notice that VELOCITY IS NOT SPEED.  Speed describes how fast something is moving.  For example, a car is going 60 mi/hr.  Velocity is the measure of both the speed and direction of an object.  For example, the car's velocity is 60 miles and hour north.  Velocity can increase or decrease due to a change of speed or direction.

kewlgeek555 · Answer

Though, because you don't put direction in equations, I guess in formulas and equations, speed and velocity are the same thing.  Sorry if I confused you.

anonymous · Answer

no they are not.. in the formula of K.E.. you exclusively put SPEED of the moving object and not THE VELOCITY.. 

and in formulas u DO put direction by making use of vector notations (arrow head)

jt950 · Answer

i think we use magnitude of velocty(speed) in kinetic energy right?

jt950 · Answer

Total energy mean by kinetic energy + potential energy
How do i calculate that?

anonymous · Answer

yes you are right.. you just plug in the magnitude of the velocity which is speed :).. 

and P.E only comes into picture when you are doing work against some force like gravity or spring or something.. since none of them are coming into picture, i think its safe to not worry about the potential energy!