please refer to attached photo.

Activity - Gen. Physics 12 - Titanium Friction For number 1, please show your complete solution. For number 2 and 3, please explain it connected to topic which is friction. 1. Find the coefficient of friction on an unknown material with a static friction of 15.5 N and a normal force of 200 N. 2. What is easier to push, a wooden cabinet in a concrete flooring or a wooden cabinet in a tiled flooring? 3. Inside a motorcycle machine, the wheel and axle are subject to rust and corrosion that is why, mechanics time to time make sure to put some oil and other lubricants. What is the purpose of the oil and lubricants and why