Andrew pokes a marble, and the marble rolls down a ramp. The marble moves with speed. Which forces are acting on the marble in this situation? When Andrew pokes the marble, he gives it force. As the marble rolls down the ramp, force pulls it down. The movement of the marble is slowed down by from the ramp.

an ion is a charged atom or molecule. it is charged because the number of electrons do not equal the number of protons in the atom or molecule. an atom can acquire a positive charge or a negative charge depending on whether the number of electrons in an atom is greater or less then the number of protons in the atom.

answer a fan shaped mass of sediment deposited at the base of a mountain front do to an abrupt change in stream gradient;