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Chemistry 9

5. Problem Solving

For solving math and science word problems, it is helpful to follow a careful process:

  1. LIST: Read the question and make a list of the important information.
  2. DIAGRAM: drawing a diagram of the situation may help you to understand the problem more clearly.
  3. EQUATION: Choose the appropriate equation(s) that you will need to solve the problem.
  4. SOLVE: replace the variables in the equation with known values from your list. Solve for the unknown.
  5. CHECK: Check to see that your answer makes sense. 


A 4000 kg truck travels in a straight line at 10.0 m/s. What is its momentum?

LIST:

  • m = 4000kg
  • v = 10m/s
  • p = ?

DIAGRAM:


EQUATION:

p = mv

SOLVE:

p = 4000(10)

p = 40,000kg·m/s

CHECK:

Answer is positive, and large, as expected.



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