I found the answers here. Hope this helps you! https://1.cdn.edl.io/sJTle6yxt3qVq7jHfdHRZJ3Xogj7ps6swBO9umNcZ6PO3SMN.docx
As the Force of friction is equal to

µ

by using the Law of Action Reaction; as the force normal is the conterforce of gravity

µ


µ

Therefore, by looking at the equation we can infer that
The force of friction is directly proportional to the mass, gravitational constant, and the co-efficent of friction
Because the gravitational constant is dependant on gravitation, a planet's mass and radius also affect the force of friction
But DO NOTE:
That the co-effecient of friction is only applicable between two rubbing surfaces and unaffected by gravitational constants.
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translate it to English so that we also know the meaning
If a football player has more mass, they will also have more <u>momentum</u>. This is because mass is directly proportional to momentum.