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# physics revision watch

1. I'm currently struggling with a level physics as fields isn't my strong suit as well as my teachers being awful. Anyone got any good physics revision/tutorial websites that cover the following topics or could someone try explain the following:

How to find the distance between two point charges where the potential is 0

How to calculate moments

if you want we can do it over skype.
2. (Original post by not_lucas1)
I'm currently struggling with a level physics as fields isn't my strong suit as well as my teachers being awful. Anyone got any good physics revision/tutorial websites that cover the following topics or could someone try explain the following:

How to find the distance between two point charges where the potential is 0

How to calculate moments

if you want we can do it over skype.
The first one I'm not sure what you mean. Could you elaborate on it.

The second part a moment is just another name for torque and the torgue equation is T =Fr where F is force and r is the distance between the central axis of rotation. Also note if the force being applied is at an angle to the axis of rotation it is the equation Frsin0. (I don't know how to use latex so the 0 equals feta in this instance).

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3. (Original post by RossB1702)
The first one I'm not sure what you mean. Could you elaborate on it.

The second part a moment is just another name for torque and the torgue equation is T =Fr where F is force and r is the distance between the central axis of rotation. Also note if the force being applied is at an angle to the axis of rotation it is the equation Frsin0. (I don't know how to use latex so the 0 equals feta in this instance).

Posted from TSR Mobile
e.g two point charges of +4nC and -6nC are 80mm away, find the point where the potential is 0 between them.

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