Describing Motion.

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Presentation transcript:

Describing Motion

Speed The distance an object travels in a certain amount of time. Average speed – Total distance divided by total time Constant speed - Speed that does not change over time On your paper, describe an example of an object at a constant speed.

What is the formula for calculating speed? Speed equals distance divided by time. S = d t

Let’s Practice Calculating Speed In your notes, calculate this problem. Make sure you show all work! One side of a track is about 100 meters long. If it takes a person 20 seconds to run its length, how fast was the person running?

Remember to label the UNITS!! Check Your Work One side of a track is about 100 meters long. If it takes a person 20 seconds to run its length, how fast was the person running? Speed = Distance ÷ Time Speed = 100 m ÷ 20 s Speed = 5m/s Remember to label the UNITS!!

Velocity An object’s speed and direction at a given time The wind is blowing 65 km/hr from the North. On your paper, describe an example of velocity.

Acceleration A change in the direction or velocity of an object over time – which may be: A change in speed Starting Stopping Speeding up (positive acceleration) Slowing down (negative acceleration) A change in direction Acceleration is caused by unbalanced forces. On your paper, describe an example of an object accelerating.