It's kind of hard for me to explain but to further understand this topic you can google the deference between mass and weight. Both mass and weight are both related to matter to that's why matter is a.
Weight is determined by gravity because you would way less on the moon that doesn't have that much of a gravitational pull. That's why people jump really high on the moon. that's also why the location determines the amount.
Mass however doesn't change by gravity. When you go to the moon you do not loose more of yourself or become smaller, you stay the same size. That is part of mass.
The first thing you should know is that the friction force is equal to the coefficient of friction due to normal force. Therefore, clearing the normal force we have: The friction is 565N. (565 / 0.8) = 706.25N. weight.
