A student rubs a glass rod with a piece of silk to charge it. He then touches it to a metal sphere hung from a string. Which statement correctly describes what
happens?
a) The metal sphere will be attracted to the glass rod after it is touched.
b) The metal sphere will be repelled by the glass rod after it is touched.
c) The metal sphere will have a negative charge after the glass rod touches it.
d) The metal sphere becomes neutral once the glass rod is removed.

What is a good example of instantaneous speed

If two students are running down the hall toward each other, trying to get to class, and they have the same mass and acceleration, what will happen when they collide? will their forces cancel out or will each one experience a reaction?

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