1 / 9

Acceleration

Acceleration. What does it mean to accelerate anyway??. TO ACCELERATE YOU MUST CHANGE YOUR VELOCITY!! VELOCITY CHANGES IF…. 1. Increase Speed 2. Decrease Speed 3. Change Direction

carrington
Download Presentation

Acceleration

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Acceleration

  2. What does it mean to accelerate anyway?? • TO ACCELERATE YOU MUST CHANGE YOUR VELOCITY!! • VELOCITY CHANGES IF…. • 1. Increase Speed • 2. Decrease Speed • 3. Change Direction • Acceleration- rate at which velocity changes over time; an object accelerates if its speed, direction, or both change • -any change in velocity • Why? Because velocity includes speed and direction

  3. Change in Velocity • Each time you take a step you are changing the velocity of your body. • You are probably most familiar with the velocity changes of a moving bus or car. • The rate at which velocity (speed or direction) changes occur is called acceleration.

  4. Acceleration Equations Acceleration= final velocity- starting velocity time Change in velocity = final – starting velocity velocity Acceleration= change in velocity time Acceleration = ∆velocity time SI units for acceleration = m/s2 , mi/h2 , km/h2

  5. When is it positive or negative acceleration? • *small acceleration → means speed is ↑ slowly • *large acceleration → means speed is ↑ rapidly • + acceleration- velocity is ↑ (obj. speeding up) • -ex. Pressing on gas pedal in a car • - acceleration- velocity is ↓ (obj. slowing down) • -ex. Pressing on the brake pedal in a car • Important- acceleration does not always mean “speeding up” b/c it’s any change in velocity

  6. Positive acceleration Negative acceleration

  7. - A constant acceleration produces a straight line or linear slope (rise/run). - The slope of a non-linear velocity-time graph (rise/run) will predict an objects instantaneous acceleration. a = v/t

  8. A car traveling at 60 mph accelerates to 90 mph in 3 seconds. What is the car’s acceleration? Velocity(final) - Velocity(original) = Acceleration time 90 mph - 60 mph = 3 seconds 30 mph = 3 seconds = 10 mph/second

  9. A car traveling at 60 mph slams on the breaks to avoid hitting a deer. The car comes to a safe stop 6 seconds after applying the breaks. What is the car’s acceleration? Velocity(final) - Velocity(original) = Acceleration time 0 mph - 60 mph = 6 seconds - 60 mph = 6 seconds = - 10 miles per hour per second

More Related