1 Speed, Velocity, & Acceleration Slide Show #2 2 What is motion? An object is in MOTION when its distance from another object is changing. Whether you.

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Presentation transcript:

1 Speed, Velocity, & Acceleration Slide Show #2

2 What is motion? An object is in MOTION when its distance from another object is changing. Whether you are moving or not depends on your point of view.

3 Reference point A reference point is used as a comparison to determine if something is in motion. An object is in motion if it changes position relative to a reference point.

4 Distance & Displacement The basic SI unit of length is the meter. Distance is the total ground covered during motion. Displacement is the change in an object’s position.

5 Speed Speed refers to "how fast an object is moving." Speed is how much distance is covered during a certain amount of time. Speed = Distance divided by Time

Constant Speed is Cruise Control! Traveling at the same distance each second

7 Average Speed = Total Distance divided by Total Time!

Instantaneous Speed Speed at a given instant A Speedometer records your instantaneous speed

9 Velocity When you know the speed AND direction of an object’s motion, that is velocity!

Acceleration is a change in velocity Speeding Up Slowing Down Changing Direction

SPEED Speed = Distance Time s = d/t d s t Measured in metres per second (m/s) also km/hr or mph

12 If a horse can travel 21 meters in 3 seconds, what is his speed? We have distance. We have time. We need speed. Speed = Distance/Time Speed = 21 meters/ 3 seconds Speed = 7 meters/second Speed = 7 m/s

13 Nascar Travels 600 miles in 3 hours. What is the speed?

14 British-made Thrust SSC “Fastest car on Earth” Can travel 380 miles in 0.5 hours. What is its speed?

15 TGV – Trans Grande Vitesse France – no longer the fastest train! Travels 800 kilometers in 2.5 hours **Change miles to kilometers** What is the speed?

16 Spirit of Australia “Record-Breaking Speed” Hydroplane Boat Travels 239 miles in 0.75 hours. What is the speed?

17 Lockheed SR71 “Fastest plane ever made” Travels 2200 mph