1. Physics Section 1.3 Identify types of variation from graphs Data and graphs volume (cm 3 ) | mass (g) 10 | 20 15 | 30 20 | 40 25 | 50 m = kv Graph is a line. A direct variation is modeled by an equation in the form y = kx.

2. Inverse variation Velocity (m/s) time (s) 10 10 20 5.0 40 2.5 100 1.0 v ∙ t = k Velocity varies inversely as time. Graph is a hyperbola. An inverse variation is modeled by an equation in the form: xy = k or y = k/x.

3. Quadratic variation time (s) distance (m) 1.0 2.0 2.0 8.0 3.0 18.0 4.0 32.0 5.0 50.0 d = kt 2 distance varies directly as the square of time. The graph is a parabola. Equation takes the form: y = kx 2

4. Dimensional (unit) analysis is the computation of the units in a calculation. (17 cm)(121 cm) 960 g / 50 cm 3 Order of magnitude is an estimate of a quantity to the nearest power of ten. length of a desk width of the room distance to Salina

5. Assignment Page 25 Problems 2 - 5