Acceleration Define Acceleration. What are the units for acceleration. Is acceleration a scalar or vector quantity Objective(s)/SWBAT (Students will be able to): Cite kinematic equations Solve constant acceleration problems Activities: Derive 4 kinematic equations 2 or 3 example problems Closure: Students solve constant acceleration problems Assessment: Problem set Test Keystones: 3.2.B

Today Students will be able to: Site kinematic equations Solve constant accelerations problems Derive the kinematic equations Do problems 19, 21, 23 (odd year) Do problems 20, 22, 26 (even year) Keystones: 3.2.B

Kinematic Equations Acceleration is defined as the rate of change in velocity.

Assume constant acceleration Kinematic Equations Area = Vit Area = ½(Vf - Vi)t Vf Vi t Assume constant acceleration

Second Equation The area under the curve on a velocity vs. time graph yields displacement.

Kinematic Equations Keystones: 3.2.B Do problems 14 They do Students work on section 2-4 problems Keystones: 3.2.B

Example Problem At highway speeds, a particular automobile is capable of an acceleration of about 1.6 m/s2. At this rate, how long does it take to accelerate from 80 km/h to 110 km/h? Do problems 14 They do Students work on section 2-4 problems Keystones: 3.2.B

Example Problem A car accelerates at a constant rate from 15 m/s to 25 m/s while it travels 125 m. How long does this motion take? Do problems 14 They do 2nd example problem. Students work on section 2-4 problems Keystones: 3.2.B

Example Problem A bike rider accelerates constantly to a velocity of 7.5 m/s during 4.5 s. The bike’s displacement is + 19 m. What was the initial velocity of the bike? Do problems 14 They do 2nd example problem. Students work on section 2-4 problems Keystones: 3.2.B