Problem Solving in Physics Dawson High School Physics

The Problem Solving Philosophy  Most formal methods for problem solving share a few basic steps. First, the problem must be identified. Next, a possible solution is proposed. Then, the solution is implemented. Finally, the solution is evaluated to see if it works.  We can apply these steps to physics using the GUMMIES method.

Step One: Givens Write down what you know.  Draw a diagram or picture.  Write down the known variables as equations with their units. For example, v i = 2.0 m/s. Do the units match? (If not, convert) How many sig figs are in each known?

Step Two: Unknowns Write what you want to find out.  Write down the unknown variable as an equation. For example, x = ?  Identify what its units will be.

Step Three: Model and Method Decide on a plan to get the answer.  Decide what model applies to the problem. Is it constant velocity, constant acceleration, etc.?  Identify a formula from that model that relates the knows and unknowns.  If more than one formula is required, make a plan of how you will use the formulas.

Step Four: Implementation Carry out your plan  Rearrange the formula to solve for the unknown.  Plug in the knowns and solve.  Write the answer to the correct number of sig figs.  Add correct units to the answer. The units should be apparent from the formulas used.

Step Five: Evaluate Solution Check your answer  Put the answer in the original equation and see if it works.  Ask if your answer makes sense.  Check if your answer has the correct units.