Yes, less tread to channel the water.
Agressive tread, bad alignment
good trac on dry bad on wet
Yes. the rubber is being worn away from the tire expeditiously.
The "tread" is the part of the tire that is supposed to touch the ground. A tire with no tread would be a tire that is not supposed to touch the ground. You may be wondering why tires have a pattern of grooves (a.k.a., voids) in the tread. They're for bad weather. The grooves allow rain, and (if they're wider) mud and snow to squelch out from under the tire so that the tread can come into contact with something solid on which to get a grip.
You need new tires of the tread is wore down to the base of tire. put a nickel between the treads. head facing toward the tire. if the tread is not touching the head you really need new ones. if in the rain or snow u have trouble staying on the road. that is bad too.
Cupping of tires indicates many of things depending upon where the cupping is. Center tread cupping is a sign of under inflation or bad shock absorbers while cupping on the edges can indicate bad wheel bearings, bad ball joints or bad steering.
A worn ball joint will cause tires to wobble or rotate in odd ways, causing uneven tread wear. If you suspect a bad ball joint get it professionally checked or changed ASAP.
It would, but it might be bad for the tires, any oil that ran on to the tread could dangerously reduce traction, and there are many safe reliable products intended for that purpose.
Check your tread. Most of the time low tread will do that. Your car's tires dont have to be bald to start sliding. If you used any cleaner on your tread, that could be the issue too. I put black cleaner to make the tires look brand new, and that was a bad mistake. I had to end up getting new tires because they were so treacherous in rain. Take it to a local garage, but only if you trust them. The phrase "My back tires are sliding" sounds like Cha-Ching! to them. Good luck, and God bless!
If your tires are in good shape, it's probably just tire balance. Low speed wobbles and shakes are normally bad tires, tread separations, just FYI.
It is usuall on the inner part of the tread, the tread lugs are worn with dips in it. It is different then feathered tires which have 1 edge of the tread worn more than the other- It can seen when bad, but it is easier to feel by running your had front to back and vis-versa. It will feel shaper in one direction. Scalloped is usually due to damaged/worn parts, feathered is normally due to excessive toe condition.