Ch. 11 Sec. 3 Acceleration.

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Presentation transcript:

Ch. 11 Sec. 3 Acceleration

Acceleration Rate of change in velocity. Really a description of “how fast you can go in a certain amount of time”. Good acceleration is being “quick to change”.

Change in Speed Acc. = final velocity – original velocity time Push or pull feeling Acceleration by increasing speed or decreasing in speed (negative acceleration) Acc. = final velocity – original velocity time Units: m/sec/sec

Change in Direction Turning a curve changes acceleration even at constant speed Constant Acceleration Steady change in velocity in a straight line

Acceleration Problem A car increases its speed from 60 km/hr to 80 km/hr in 4 seconds. What is the car’s acceleration? Acc = Δ velocity time 80 km/hr – 60 km/hr 4 sec. 5 km/hr/sec. 1st second – 65 km/hr 2nd second – 70 km/hr 3rd second – 75 km/hr 4th second – 80 km/hr

Acceleration problem An airplane reduces its speed from 250 km/hr to 175 km/hr in order to come into the run way. What was the negative acceleration of the plane?

Speed-Time Graph Slope of the speed time graph is acceleration

Distance-Time Graph Nonlinear graph showing accelerated motion Curve motion

Instantaneous Acceleration How fast velocity is changing at a specific instant Involve change in velocity or direction Always changing

Acceleration problem A runners acceleration is 5.5 m/s/s. If the runner first starts at 0.0 m/s and has a final velocity of 21.0 m/s. How long will it take?

Rates of Motion Table Rates Definition Equation Unit Graph Speed Velocity Acceleration