AQA Physics GCSE P2 & P3 [OFFICIAL THREAD]

if i got an A* in p1 a low B in p2 an A in p3 and a high B in coursework (1 off an A, 25% of final grade) what would my overall grade be??

Guys i think we should go through the CGP revision guide together on this chat.This might sound weird but if your hear and trying to revise then you probaly are stuck on all the Motor effect stuff etc. Shall we just start with page 74 of the CGP guide and sorta talk about it and tell each other facts as we go along. If anyone wants to join in this thing im talkin about then just send a reply on the post !

Can someone please explain to me in simple terms how to calculate the centre of mass of an object?
I don't understand it because the CGP book isn't very clear, in my opinion

1) If it's a symmetrical object just find the centre of all the points of symmetry

2) If it's an asymmetrical object you suspend it from a plumb line (basically a nail with a string & weight attached to the end of the string) & draw a line across it, & then repeat using different points around the object until you find the centre

Think this is right, hope it helps!

Post 1 : When you pass a current through a wire , you get a magnetic field around the wire.

Post 3 : The force experienced by the wire is increased when the current or magnetic field is increased.

If the wire is parallel to the magnetic field then you get no force , and instead the wire has to be 90 degrees to the magnetic field.
P.s anyquestions you want answered just put a post

The force is reversed when current is reversed or direction of magnetic field is reversed.

Does anyone know how to write a good answer to a forces question? The mark schemes always seem to change their mind on what they want, e.g. mentioning work done or not

can someone explain electromagnetic stuff and flemmings left hand rule please?