Can be a dead battery, defective starter, loose or corroded battery connection, or blown main fuse. If nothing comes on when you turn on the ignition switch and your interior lights are not working it is not the starter.
Have your battery checked .
The belt could need some dressing, or the pulley could bent. The belt could need an adjustment.
The idler pulley has nothing to do with the brakes. If the idler pulley is bad it could throw or break a belt, and then your engine will stop.
the pulley on the harmonic balance drives the alternator belt. this is the pulley at the bottom of the engine ,on the front of the crank shaft if this pulley is not turning you have a problem. this means either the key is missing or the crankshaft is broken
If a car engine stalls when turning, there could be a problem with the power steering pump. There could also be an issue with an emissions control device.
Not sure what your doing but you can use a strap wrench around the bottom pulley to hold the crank from turning.
it was called a pulley because you could hang stuf on it and then you could pull it... a pulley could be a crane or esaltor.
The angular velocity of a pulley turning 1800 rpm is 60 pi radians per second.
The bolts holding the air conditioner compressor could be loose or the A/C pulley could be out of balance.
a gear or a pully
I need to know more, what model, what engine? It could be a belt, could be a pulley, could be a cam synchronizer.
Belts need replacing or ajusting. They are slipping on the pulley.
you could use motor to do a investigation and it is a object to use in science.