changing velocity. constant velocity vs. changing velocity velocity is either constant or...
DESCRIPTION
Constant velocity vs. Changing velocity We have a changing velocity if ANY of the following change Magnitude of the velocity Direction of the velocityTRANSCRIPT
Constant velocity vs.
Changing velocity
• Velocity is either constant or changing.
• To be constant, the magnitude and the direction can not change.
Constant velocity vs.
Changing velocity
• We have a changing velocity if ANY of the following change
• Magnitude of the velocity
• Direction of the velocity
Try It!• If Kareem Cheese drives his car at 120 km/h north and then turns around to go 120 km/h south, does he have a constant velocity?
• Are his speeds on his north bound and south bound trip the same?
Acceleration• Any time we change speed or direction, we have a change in velocity.
• The measurement of this change in velocity is called acceleration.
• Is acceleration a scalar or vector quantity?
TRY IT!
• Hal Apenyo races his car from a stand still to 50m/s. He does this in 4.20 seconds. What is his acceleration?
• 11.90 m/s/s
Try it!
• How long will it take Pete Abred to get his car from a stand still to 75 m/s if his acceleration is 20m/s/s?
• 3.75 seconds