101 Written Homework Format This format is REQUIRED for every written HW, QUIZ, and free-response TEST problem. Step 1: MAKE A LIST of your selected variables, with their symbols and values (if known), in the upper left-hand part of your page, including the unknown (or unknowns) with a question mark. Step 2: In the upper right-hand part of your page, draw an appropriate sketch for the problem. Label relevant objects, arrows, etc. in your sketch with their appropriate symbols and/or values. A VERY few problems (such as those that involve only the manipulation of units) may not require a sketch. Step 3: Below your sketch, explain clearly, in words, your strategy for solving this problem. What physical principle is relevant? How does that physical principle relate to the objects, motions, forces, etc. in the problem? Step 4: Below your description of your strategy, express the relevant physical principle with an equation in symbols. If necessary, do the algebra required to isolate the unknown variable on the left-hand side of the equation. Step 5: BEFORE SUBSTITUTING ANY VALUES INTO YOUR EQUATION, do any necessary unit conversions (for example, you might need to convert km/hour into m/s). Very simple conversions (such as cm into m) can be done as a part of Step 1. Step 6: Substitute the number value AND UNIT for each symbol in the equation. UNITS ARE REQUIRED AT EVERY STEP. You cannot simply write in the unit beside you final answer; if you do you will receive very little credit. Step 7: Do the indicated mathematical operations on the number AND ON THE UNITS to get your result for the unknown with units. Step 8: Check the reasonableness of your answer. For example, if the unknown was the speed of a human runner, an answer of 100 m/s or more would not be reasonable. If your answer is not reasonable, go back and check your work. Wildly unreasonable answers will be graded harshly. Step 9: Draw a box around your answer to indicate that you have finished this part of the problem. Step 10: If a problem has multiple parts, a second sketch may not be required. Any variables listed in an earlier part do not need to be listed again for the second part. List any new variables needed for the new part, draw a new sketch if necessary, explain your strategy, etc.