# eqns - University Physics I Equation Sheet and Homework and...

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University Physics I Equation Sheet and Homework and Test Instructions It is imperative that your work be neat and clear . To receive full credit for a problem, your work must convincingly demonstrate that you understand the physics behind that problem. This means not only providing the correct answer but also showing how you obtained your answer. There should always be a symbolic expression for any formula. The symbolic equation is what you should manipulate, then, substitute in your numbers, with units. Report final answers with correct units and vector expressions. There should be enough English to give the reader some idea of what you are doing without looking at the math, and the diagrams need to be big enough (and neat enough) that they can be clearly read. Equations for the first test: Vectors: have magnitude and direction ~ r = r ˆ r where r = | ~ r | ≡ length of ~ r and ˆ r = ~ r r direction of ~ r Uniformly accelerated motion: x ( t ) = x 0 + v 0 t + 1 2 at 2 Δ x = v 0 Δ t + 1 2 a Δ t 2 Δ x = v Δ t = x f - x i v ( t ) = v 0 + at v 2 f

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