No, the only thing required to make an object produce sound is to apply enough sudden force onto a minimally supported object, forcing it to dissipate that force all by itself. To do this the object vibrates, which produces sound.
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When the bow hits the strings, friction occurs. Different levels of friction make different sounds.
They loose 66% of their power to heat and sound through friction. A Bugatti engine would make 3003 Bhp if there was no sound or heat loss due to friction.
The "ha" sound is produced by exhaling forcefully, which creates friction and turbulence in the air, causing it to heat up. This is why the "ha" sound can make hot air.
Friction is the resistance to movement of an object pressing/resting/moving on a surface. It's not intuitively obvious but the standing still friction and moving friction are different. Assume you have a block of wood resting on a tabletop. The amount of force required to make the block begin to move (static friction) is greater than the force required to keep it moving (kinetic friction) after it has begun to move.
lung sound in a person with pleural friction
By snap I assume you mean snapping your fingers, if that's the case, the answer is no, the sound generated from your fingers are caused by friction and when you fail to make a sound it just indicate that there is insufficient friction, thus it is just a technique that not perfected!
Sound energy is mechanical energy. No devices are required to make a conversion.
The crackling sound is caused by static electricity, which is produced by the friction of your jersey.
yes
No, friction is not required for standing straight. Gravity and the interaction between your body and the ground provide the necessary support to maintain an upright position without the need for friction.
The friction graph shows that as surface roughness increases, the force required to overcome friction also increases. This indicates that there is a positive relationship between surface roughness and the force needed to overcome friction.