what is the Radial and Tangential acceleration in circular motion?? :)

Question

anonymous · Answer

circular?

aravindg · Answer

well that was a bad example  ...i dont like it :P i will tell u simple one

anonymous · Answer

being honest here.. I am so no good in physics.. hahahahaha..

aravindg · Answer

consider a ball rolling down a mountain ,now tell me what are the type of motion it undergoes?

anonymous · Answer

there is linear motion (i think..) and for sure circular motion.. the rest i dunno..

aravindg · Answer

ya correct those are the 2 motions!!
the ball undergoes both translational and rotational motion

aravindg · Answer

*types of motions

anonymous · Answer

then.. what's radial and tangential acceleration? (lazy to think.. need someone who said it directly)

aravindg · Answer

well so why does it move forward?
due to acceleration right?that acceleration is termed tangential acceleration or linear acceleration

aravindg · Answer

we can also see that the ball's rotational speed increases

anonymous · Answer

hooooo... ic.. :) 
okay.. kinda get it.. :D hahahahaha!! thanks mate!!

aravindg · Answer

thats due to rotational acceleration

aravindg · Answer

nw  lets move to circular motion

aravindg · Answer

|dw:1336047218087:dw|

aravindg · Answer

as shown in fig during a circular motion the body experience acceleration towards centre which helps it to move in circular path ,this acc is called radial acceleration,it is always directed to centre

anonymous · Answer

they are perpendicular to each other??
so does it mean that if we do dot product, we will get zero? (wait dot product or cross?)

aravindg · Answer

whereas the tangential acceleration is perpendicular to the radius of the circle

aravindg · Answer

why do u need dot product of two accelerations? u will never encounter it

aravindg · Answer

no rewards?

anonymous · Answer

hmmmm... hahahaha.. actually this is math question.. so im trying to find the use of dot or product thing from both of them.. :D 

Thank You so much for the help!! 
I will try to write it down the answer.. :)

aravindg · Answer

no rewards?

anonymous · Answer

rewards? how?

aravindg · Answer

best answer!!

anonymous · Answer

radial acceleration is to increase the radius of the circular motion by keeping the angular velocity constant but the tangential acceleration is to increase the angular velocity by keeping the radius constant