eli5: Why do liquids sometimes increase grip?

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So we all know how car tires are less grippy when it’s wet.

But why is it better to use water or saliva on my fingers when trying to open a plastic bag, or quickly turn paper pages over?

And why does applying washing soap/shower gel to my slippery yoga mat make it grippy again?

Does this means car tires would be grippier on a soapy surface? Is so do they apply this principle in (for example) motorsports?

Thanks in advance folks!

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6 Answers

Anonymous 0 Comments

Some motor sports use bleach and water to help with the burn out. The bleach helps heat up the tires and makes them sticky for quarter mile or eighth mile drag racing.

Radio control cars use soda on the track to help with traction. It’s usually only applied to the corners and the starting line. Some use a sugar water mix, but others use generic Sprite soda. Some racers will treat their tires with simple green type cleaners to make them sticker both on and off road.

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