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The resistance a surface or object encounters when moving over another.

9 votes
5 answers
9k views

Is it correct that tires quickly get bald when used at high speed?

Does the friction increase at high speed rotation? Update: The word "quickly" means that the tire gets bald with less distance traveled. …
kiss my armpit's user avatar
1 vote
1 answer
5k views

Finding friction forces of stacked boxes on a table

The given friction coefficients are for static. Let $g=10$ (meter per square second). … If the $F(t)=10t$, for example, determine the friction forces $f_{AB}(t)$ (between the boxes $A$ and $B$) and $f_{BF}(t)$ (between the box $B$ and the floor). …
kiss my armpit's user avatar
0 votes
1 answer
2k views

When we are walking or running, which friction is exerted on our feet? Kinetic or static?

As already mentioned in the title, when we are walking or running on the floor, which friction is exerted on our feet? Kinetic friction or static friction? … In my understanding, the answer is static friction because our feet do not slide on the floor. Is my understanding correct? …
kiss my armpit's user avatar