Bellringer 8/30  What is the difference between speed and velocity?

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Presentation transcript:

Bellringer 8/30  What is the difference between speed and velocity?

Today’s Target… I can use observations and appropriate tools to document the position and motion of objects. This means I can make observations about how an object’s motion changes.

Acceleration

REVIEW What is motion? How do we know an object is in motion? How do we measure motion? What is the difference between speed and velocity? How do we find speed?

Acceleration Consider this: a car is stopped at a red light, when the light changes the driver gently steps on the accelerator and the car speeds up or accelerates In everyday language acceleration means “the process of speeding up”

Acceleration Acceleration is the rate at which velocity changes Remember that velocity is speed and direction Acceleration is increasing speed decreasing speed changing direction

Increasing Speed Any time the speed of an object increases it experiences acceleration What are some examples of acceleration? A car that moves from a stopped position Runners taking off

Decreasing Speed Decreasing speed is also acceleration Called negative acceleration or deceleration What are some examples of deceleration? A ball rolling to a stop A car coming to a red light An airplane landing

Changing Direction Remember that velocity involves both speed and DIRECTION, so a change in direction is also acceleration You may think that a car traveling at constant speed does not accelerate, but actually it does because it will change directions!

Changing Direction Examples: Race car drivers rounding a turn Any circular motion The seats on a Ferris wheel

Did you get it? How is it possible for a car to be accelerating if its speed is steady at 65 mph?

Determining Acceleration Speed Time 60 km/h 0s 62 km/h 1s 64 km/h 2s 66 km/h 3s

Determining Acceleration Speed Time 12 m/s 0s 8 m/s 1s 4 m/s 2s 0 m/s 3s