<p>What are some equations/tips and tricks that are not provided on the official equation sheet? I’m talking stuff like Torricelli’s law which is v = sqrroot(2gh) and the right hand rule for magnetism and wires. Got anything?</p>
<p>If you know the law of conservation of energy you can get a 3.</p>
<p>what is torricellis law for?</p>
<p>The “obscure” laws are generally things that are better off being derived. Torricelli’s Law, por ejemplo, can be derived in a single step using conservation of energy (mgh = .5mv^2). That way you can understand how to adapt to various situations rather than memorizing a bunch of equations that you might use in the wrong situation.</p>
<p>agreed.
magnetic dipole = p =2aq where a is the distance between the two charges
torque due to magnetic dipole = pEsin(theta)
U = -pEcos(theta) … note that this is negative</p>
<p>^^^ all this is for electric dipole</p>
<p>Do you guys know if dipoles are really on the test? My teacher covered them in all of the chapters where they came up, but we’ve never actually seen any on the practice AP tests we’ve done.</p>
<p>Anyway, some of the equations she told us to memorize are various shape-based ones such as rotational inertia, electric potential, electric field, and magnetic field due to a variety of shapes.</p>
<p>I have seen problems with dipoles before. There is the standard two charges on a line problem asking about where E or V is zero, which will almost definitely show up on the test. They can describe it as a dipole and you would need to know what that means. I think that’s a problem in the PR. Regardless, it doesn’t add any difficulty to an already easy problem.</p>