Assuming you are talking about a car motor/combustion engine, it is the sound of the pistons being moved by the combustion of fuel.
as a car with a motor
A worn belt can make a squealing sound with the motor running. A seized clutch can also make this sound.
Depends, i bet that car probably had a supercharger
Gas and a spark are the two necessary things that make a car motor work.
Most likely your fan blade mechanism inside heater motor is discounted from motor, or loose from motor.
looks like the starter motor. the clicking sound appears to be the solenoid on the starter motor. when you turn the ignition, the solenoid click and its supposed to make contact to the motor. if the contacts are dirty, then the car won't start. repeated clicking will eventually make a little contact allowing the motor to turn. try changing the starter motor or servicing it. you can do it urself. remove the motor and pull the solenoid out. clean the brass contacts. they should be under the connections where the wire from ur battery connects. if it seems to be too much work, just get the motor replaced.
Motor mounts don't make noise themselves, but the motor moving might. With the hood up and a helper stand to the side of the car. Put the car in gear, while holding the brake pedal down, and give it some gas. Do the same thing in reverse. You should see the motor physically move if there is a broken mount.
because the gears are grinding together if its an old car it will make a louder crack sound
There is no sound if they are in good working order.
The point of a car amplifier is the make music sound better, so in most cases all amplifier make music sound better.
I have a 2004 and it was the the motor shifting side to side, cause what was holding the motor was broke so the motor was just kinda hanging there hope this helps..