sorry people... just another question!!! (1 Viewer)

[physician]

In theme parks there is often a rotating drum that people stand in as it spins and the floor dropped away. Imagine a 70 kg person in this ride.

( a ) Idnetify the force that would stop the person sliding down as the floor dropped away:

(would that possibly be the centripetal force acting on the person? but i think a more specific name for that centripetal force is needed)

( b ) Claculate the magnitude of this force:


( c ) people who ride these machines feel as though they are pushed against the wall of the rotating drum. Explain the forces involved in this.

 

[Xayma]

It is actually friction that stops them from dropping away, it is increased by the increase in the normal raction of the wall to the body created by the centrifugal force (I actually think it is in this case with the machine providing the centripetal force (ie the normal)).

 

[physician]

It is actually friction that stops them from dropping away, it is increased by the increase in the normal raction of the wall to the body created by the centrifugal force (I actually think it is in this case with the machine providing the centripetal force (ie the normal)).

oh friction ok... so is it the same case in my previous multiple choice question about sattelites dropping to earth....

 

[Xayma]

Sort of, but no. In this case it is static friction, in the other one it is kinetic. Basically the friction opposes both, in this case however, it varies so it only stops the motion, in kinetic it is a constant (for the conditions).

But that is why the material along the walls is carpet like, since it has a high coefficient of friction (something you wouldve have felt if you were to get carpet burn).

 

[physician]

Sort of, but no. In this case it is static friction, in the other one it is kinetic. Basically the friction opposes both, in this case however, it varies so it only stops the motion, in kinetic it is a constant (for the conditions).

But that is why the material along the walls is carpet like, since it has a high coefficient of friction (something you wouldve have felt if you were to get carpet burn).

cool thanks man.. i appreciate ur help..

would u have any idea as to how to calculate the magnitude of the force?... would it simply just be Fw = mg....???