electrostatic (GCSE physics)

• what is the relative charge of a proton

  +1
• what is the relative charge of a neutron?

  0
• what charge does an electron have?

  -1
• what is the relative mass of an electron?

  1/2000
• what happens to an atom is electrons are removed?

  it becomes positively charged because there are more protons
• what happens to the atom when electrons are added?

  the atom becomes negatively charged — there are more electrons
• what is the atom if it h the same number of protons and electrons?

  neutral
• what is the only particle can move?

  electrons
• what happens when you rub two insulating materials together?

  electrons may transfer from one to another
• which type of particle cannot move?

  proton
• what is friction?

  the force resisting the relative motion of solid surfaces sliding against each other in the opposite directio.
• do insulators have free electrons? if not, what cannot flow?

  no, charge cannot flow through them
• when charging an object by friction, which part of the object will be charged?

  only the area that was rubbed
• describe an experiment to investigate charging materials by friction?

  1. reset coulombmeter
  2. rub polythene strip with a cloth (do NOT touch with hand or it may lose charge!)
  3. touch the charged strip onto. cap of coulombmeter
  4. repeat process with acetate strip
• what happens to the strip when it is rubbed?

  when the two objects are rubbed, enough energy is generated to move elecctrons around. the strip them becomes positively charged as there are more protons