how does an object become negatively charged?
it gains electrons.
it loses electrons.
it gains protons
it loses protons

Current enters a circuit at a: 1.positive terminal 2.negative terminal 3.low potential side 4.resistor

If the speed of a particle triples ,by what factor does its kinetic energy increase?

When you push downward on a book at rest on a table, you feel an upward force. does this force depend on friction? defend your answer.