Answer:
I can't read the questions they aren't in the photo
Answer: Friction is the force resisting the relative motion of solid surfaces, fluid layers, and material elements sliding against each other. There are several types of friction: Dry friction is a force that opposes the relative lateral motion of two solid surfaces in contact
Answer:
The answer to the very last one is: Boyle's law. Pressure and volume are inversely proportional as the new variable changes from the known. Pressure doubled equals 1/2 of original volume, assuming temperature remains the same. So 40.0 mL is the new volume as it is compressed.