What are two reasons why density is a useful physical property for identifying substances?

What object a collides with object b and bounces back its final momentum is?

What is the coefficient of kinetic friction μk between the block and the tabletop?

Match each vocabulary term to its definition. 1. electrons neutral subatomic particles found in the nucleus of the atom 2. neutron lowest energy position of an electron in an atom 3. photon the path of an electron around the nucleus of an atom 4. ground state negatively charged, subatomic particles 5. protons packet of energy of specific size 6. element substance with only one type of atom 7. orbital positively charged, subatomic particles found in the nucleus of the atom