The normal force acts to the surface and the friction force act to the surface.

Which of these statements is true? a. quarks pair with leptons to form protons and neutrons. b. quarks pair with bosons to form photons. c. quarks pair with photons to form protons and neutrons. d. quarks pair with other quarks to form protons and neutrons. e. quarks pair with electrons to form protons.

The slope of a velocity time graph over any interval of time gives the during that interval

The coefficient of friction is a number that represents the resistance to sliding between two in contact with one another.