ACCELERATION

Acceleration- The rate of change in velocity of an object. (vector) Acceleration = Change in Velocity time a= Δv/t a= vf –vi vf= final velocity t vi= initial velocity unit: m/s2

a= Δv/t = 90km/hr-30km/hr 10 sec = 60km/hr =16.7m/s 10 sec 10sec Ex: A car accelerates from 30km/hr to 90km/hr in 10seconds. What is the cars acceleration? a= Δv/t = 90km/hr-30km/hr 10 sec = 60km/hr =16.7m/s 10 sec 10sec =1.67m/s2

(-) indicates that the car is decelerating Ex: A car traveling at 20m/s brakes and comes to a stop in 12 seconds. Find its acceleration. a= Δv/t a= (0m/s-20m/s)/12sec a = -1.67m/s2 (-) indicates that the car is decelerating

GRAPHS Direct proportion. Constant acceleration V t Negative slope. Constant deceleration V t

Graphs V Constant velocity t Constant zero velocity. Not moving V t

V Slope = acceleration The area under the line is equal to: Area = ½ (base x height) Area = ½ (t x Δv) Area = displacement

MOOSE