![]() Or repulsive (positive) comes from the signs of the charges. Overall sign indicating wherther it is attractive (negative) ![]() Inversely proportional to the square of the distance between them Square law for force on a charge in an electric field of anotherĬharge: Force is proportional to the product of the charges and The only thing that affects the time an object takes to hit the ground is the acceleration due to gravity and the distance travelled. The equation for the vertical motion for an object in freefall is: Notice, there is no mention of mass anywhere in this equation. Minus sign indicates it is ALWAYS attractive The mass of an object is completely unrelated to its free-fall motion. Square law for force on a mass in a gravitational field ofĪnother mass: Force is proportional to the product of the massesĪnd inversely proportional to the square of the distance between Transferred in a component = charge passing through it x potentialĮnergy changed into heat = potential difference x current x time X (sum of the circuit resistance and the internal resistance of Law applied to the full circuit: Electromotive force = current Law: Potential difference = current x resistance ![]() Law: combination of Boyle's Law and Charles' Law apply equations of motion to one-dimensional free-fall motion (vertical) and solve problems associated with this motion. Law: pressure x volume of a gas = number of moles x molar translate the above equations of linear motion to one-dimensional vertical motion of an object under the influence of gravity, as the motion of this object, is an example of a linear motion. In gravitational potential energy = mass x gravitational field they are symbolsįor current it shouldn't be possible to confuse it with lĭone = force x distance moved in the direction of that forceĮnergy = half x mass x (velocity squared) To take care when you write the equation letters. all units to be used in equations should be in their basic form (no prefixes) - EXCEPT mass - that is kg! Having a mathematical mind myself I find learning equations to be a shorthand way of learning Physics! However, I would argue that actually knowing them makes it easier for you to explain a physics principle.įor example if you KNOW that F=ma, then, in answer to, 'What comprises evedence of a force acting?', you know that a net force will make a body accelerate. The English examination boards now GIVE you equations - so you no longer get marks for recalling them. so it was worth transferring them properly to your mental 'hard A Level and AS level - UK KS 5 (Age 16 - 18)Īre all of the equations you used to need to recall for Physics examinations.Īt each stage it was assumed you remembered the ones from the previous.Solve basic problems concerning free fall and. GCSE and 'O' Level - UK KS4 (Age 14 - 16) Free fall is the motion of a body where its weight is the only force acting on an object.
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