Speed and Velocity Average speed Velocity Predicting the future 1524

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Presentation transcript:

Speed and Velocity Average speed Velocity Predicting the future 1524 Outline 1524 2761 Mdcl1 Mdcl!

Average Speed Distance traveled Average speed = Time spent traveling OR Not a vector! Not a vector!

Example 1 – Average Speed Example 1 – Av Speed Example 1 – Average Speed If a car travels 100 km/h for an hour, and then travels 50 km/h for an hour. The average speed is given by:

Average Velocity Displacement Average velocity = Time spent traveling OR Vector! Vector!

Example 2 – average velocity QQ6 Av Speed Example 2 – average velocity A particle moving along the x-axis is located at xi=12m at t1=1s and at xf=4m when tf=3s. Find its displacement and average velocity during this time interval.

Example 3 – average velocity QQ6 Av Speed Example 3 – average velocity The position of a particle moving along the x-axis varies in time according to the expression x=3t2, where x is in m and t in s. Find the displacement and the average velocity for the particle between t=1s and t=4s

QQ7 Av Speed Quick Quiz An athlete swims the length of a 50m pool in 18s and then makes the return trip to the starting position in 20s. Determine his average velocity in the second half of the swim: 0 m/s 2.5 m/s -2.5 m/s -5 m/s

Position from Velocity  but  

Example An object starts at r1=3m. It is moving with an QQ7X vector equation Example An object starts at r1=3m. It is moving with an average velocity of vavg= 2m/s. What is its position after a time interval of Δt=5s? Get TAs to assist with the physics