If the mass of an object increases, predict what will happen to the coefficient of sliding friction. 1. The coefficient of sliding friction will increase.
2. The coefficient of sliding friction decrease.
3. The coefficient of sliding friction will stay the same.
4. The coefficient of sliding friction will decrease by half.

Auniform electric field exists in the region between two oppositely charged plane parallel plates separated by a distance of 1.60 cm . a proton is released from rest at the surface of the positively charged plate and strikes the surface of the opposite plate in a time interval of 3.20×10-6 s. 1-find the magnitude of the electric field. use 1.60×10-19c for the magnitude of the charge on an electron and 1.67×10-27kg for the mass of a proton 2-find the speed of the proton when it strikes the negatively charged plate