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## Homework Statement

The question asks me to work out the coefficient of friction for a block accelerating down a rough slope assuming their is no air resistance, which I could do easily. In the next part it then asks how the coefficient would change if their was air resistance

## Homework Equations

F=μR

Where F=friction

μ=coefficient of friction

R=resultant force of plane on block

## The Attempt at a Solution

Well I concluded that because the surfaces are still the same the coefficient would still be the same, but the air resistance would push block down more incresing R and so slowing block down because their is more friction.

However the mark scheme said that their is less friction so coefficient must be less, which I really don't understand so I was hoping someone could explain it to me.

Any help would be much appreciated, thanks

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