7 Problem Solution Guidelines Draw a sketchIndicate origin and positive directionList the given quantities using the symbols of the equations. (si, vi, a)Is time known or do we need to find it?What are we to solve for?Write the general equations of kinematics
8 More GuidelinesRewrite the general equations using the known quantities.Look at the knowns and unknowns and map a strategy of solution.Check your unitsMake sure you are answering the question.
13 Free Fall The force of gravity points downward Air resistance ignored Acceleration of gravity near the surface of Earth is called g = 9.8 m/s2 = 32.1 ft/s2Air resistance ignoredWe have then the conditions of one-dimensional kinematics – straight line motion with constant acceleration.
14 Sample ProblemA ball is thrown vertically upward at 10 m/s. How high will it get, how long will it be in the air, and how fast will it be moving when it hits the ground.
15 Projectile Problems – Two Dimensional Kinematics Ignore air resistance.ax = 0ay = g = 9.81 m/s2 downward
16 The motions in the two directions are independent HorizontalVertical