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Unformatted text preview: SAT Subject Physics Formula Reference This guide is a compilation of about fifty of the most important physics formulas to know for the SAT Subject test in physics. (Note that formulas are not given on the test.) Each formula row contains a description of the variables or constants that make up the formula, along with a brief explanation of the formula. Kinematics v ave = Δ x Δ t v ave = average velocity Δ x = displacement Δ t = elapsed time The definition of average ve locity. v ave = ( v i + v f ) 2 v ave = average velocity v i = initial velocity v f = final velocity Another definition of the av erage velocity, which works when a is constant. a = Δ v Δ t a = acceleration Δ v = change in velocity Δ t = elapsed time The definition of acceleration. Δ x = v i Δ t + 1 2 a (Δ t ) 2 Δ x = displacement v i = initial velocity Δ t = elapsed time a = acceleration Use this formula when you don’t have v f . Δ x = v f Δ t 1 2 a (Δ t ) 2 Δ x = displacement v f = final velocity Δ t = elapsed time a = acceleration Use this formula when you don’t have v i . www.erikthered.com/tutor pg. 1 SAT Subject Physics Formula Reference Kinematics (continued) v 2 f = v 2 i + 2 a Δ x v f = final velocity v i = initial velocity a = acceleration Δ x = displacement Use this formula when you don’t have Δ t . Dynamics F = ma F = force m = mass a = acceleration Newton’s Second Law. Here, F is the net force on the mass m . W = mg W = weight m = mass g = acceleration due to gravity The weight of an object with mass m . This is really just Newton’s Second Law again. f = μN f = friction force μ = coefficient of friction N = normal force The “Physics is Fun” equa tion. Here, μ can be either the kinetic coefficient of fric tion μ k or the static coefficient of friction μ s . p = mv p = momentum m = mass v = velocity The definition of momentum. It is conserved (constant) if there are no external forces on a system. www.erikthered.com/tutor pg. 2 SAT Subject Physics Formula Reference Dynamics (continued) Δ p = F Δ t Δ p = change in momentum F = applied force Δ t = elapsed time F Δ t is called the impulse . Work, Energy, and Power W = Fd cos θ or W = F bardbl d W = work F = force d = distance θ = angle between F and the direction of motion F bardbl = parallel force Work is done when a force is applied to an object as it moves a distance d . F bardbl is the component of F in the direc tion that the object is moved. KE = 1 2 mv 2 KE = kinetic energy m = mass v = velocity The definition of kinetic en ergy for a mass m with veloc ity v . PE = mgh PE = potential energy m = mass g = acceleration due to gravity h = height The potential energy for a mass m at a height h above some reference level....
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This note was uploaded on 01/10/2011 for the course MATH 100 taught by Professor Razasuleman during the Spring '10 term at University of Engineering & Technology.
 Spring '10
 RazaSuleman
 Formulas

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