Velocity• The speed and direction of an object’s  motion.   –88 km / hr southwestImage source: http://www.myteacherpages.c...
VELOCITYSPEED IN A GIVEN   DIRECTION         d V   =         t   direction
A bird flies south at       20 m/s.• SPEED = 20 m/s• VELOCITY = 20 m/s south
A tropical disturbance spotted east of thePhilippines was moving at 60 km per hour ata Northwesterly direction and havingm...
CONSTANT VELOCITY
CHANGING VELOCITY
COMBINING VELOCITIES         How fast will this ball move?         What factors may affect its         speed?
COMBINING VELOCITIES                        Rowing speed                        = 16 km/hr                        River sp...
What is the velocity if you aremoving upstream? Combined velocity:             (V1) 16 km/hr – (V2) 10 km/hr =   (CV) 6 km...
Why is the idea of combining   velocities important to   launching    rockets?
1. A runner moving eastward covers adistance of a 100 meters in 10 seconds.What is his velocity?Given: D= 100 m     T= 10s...
3. Lisa is walking to a friend’s house. She walks 500m for 10minutes, then realizes she forgot something important tobring...
3. Lisa is walking to a friend’s house. She walks 500m for 10minutes, then realizes she forgot something important tobring...
4. Nelson is running around the track oval. The oval is 800m   long. He is running at a constant speed. It takes him 180 s...
a. What is Nelson’s speed in m/s?Given: d= 800 m   t= 180 s running at constant speed1. Formula S= d/t2. Work         V= 8...
3. Nemo is swimming his way to his best friend’s house   Crush (the turtle). Nemo is swimming at 12 km/h and the   current...
b. When Nemo leaves Crush’s to go home, he has to swim   against the current. What is Nemo’s combined velocity on the way ...
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Velocity

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Velocity

  1. 1. Velocity• The speed and direction of an object’s motion. –88 km / hr southwestImage source: http://www.myteacherpages.com/
  2. 2. VELOCITYSPEED IN A GIVEN DIRECTION d V = t direction
  3. 3. A bird flies south at 20 m/s.• SPEED = 20 m/s• VELOCITY = 20 m/s south
  4. 4. A tropical disturbance spotted east of thePhilippines was moving at 60 km per hour ata Northwesterly direction and havingmaximum sustained winds of 150 km/h?What is the storm’s velocity?Given: S= 60km/h T= 10s dir= NW1.Formula V= d/t with dir2.Work/Answer V= 60km/h NW
  5. 5. CONSTANT VELOCITY
  6. 6. CHANGING VELOCITY
  7. 7. COMBINING VELOCITIES How fast will this ball move? What factors may affect its speed?
  8. 8. COMBINING VELOCITIES Rowing speed = 16 km/hr River speedV1(Boat) = 16 km/hr (downstream) =V2 (river) = 10 km/hr 10 km/hrCombined velocity: 26 km/hr
  9. 9. What is the velocity if you aremoving upstream? Combined velocity: (V1) 16 km/hr – (V2) 10 km/hr = (CV) 6 km/hr
  10. 10. Why is the idea of combining velocities important to launching rockets?
  11. 11. 1. A runner moving eastward covers adistance of a 100 meters in 10 seconds.What is his velocity?Given: D= 100 m T= 10s dir= East1.Formula V= d/t with dir2.Work V= 100m/10s East3.Answer V= 10m/s East
  12. 12. 3. Lisa is walking to a friend’s house. She walks 500m for 10minutes, then realizes she forgot something important tobring. She turns around, and hurries back to her house. Thewalk/jog back takes her 5 minutes.Given: Total D= 500m + 500m = 1,000m Total T= 10min + 5 min= 15 min T= 10 min D= 500m D= 500m T= 5 min
  13. 13. 3. Lisa is walking to a friend’s house. She walks 500m for 10minutes, then realizes she forgot something important tobring. She turns around, and hurries back to her house. Thewalk/jog back takes her 5 minutes.a. What was her average speed in m/min?Given: Total D= 500m + 500m = 1,000m Total T= 10min + 5 min= 15min1.Formula Ave S = total D/total T2.Work Ave S = 1,000m/15min3.Answer Ave S = 67 m/min
  14. 14. 4. Nelson is running around the track oval. The oval is 800m long. He is running at a constant speed. It takes him 180 s to complete the track and get back to where he started.a. What is Nelson’s speed in m/s? Given: d= 800 m t= 180 s running at constant speed
  15. 15. a. What is Nelson’s speed in m/s?Given: d= 800 m t= 180 s running at constant speed1. Formula S= d/t2. Work V= 800m/180s around oval3. Answer V= 4.44 m/s around oval If Nelson is running at constant speed, is he also moving at constant velocity ? No, he is always changing direction (running around the oval).
  16. 16. 3. Nemo is swimming his way to his best friend’s house Crush (the turtle). Nemo is swimming at 12 km/h and the current is moving at 10 km/hr.a. On the way to Crush’s house, he swims with the current. What is Nemo Nemo’s combined velocity on the way to Crush’s house? CurrentGiven: V1= 12km/h V2= 10 km/h dir= to Crush’s house (Nemo) (current)1.Formula CV= V1 + V22. Work CV= 12 km/h + 10 km/h3. Answer CV= 22 km/h to Crush’s house
  17. 17. b. When Nemo leaves Crush’s to go home, he has to swim against the current. What is Nemo’s combined velocity on the way home?Given: V1= 12km/h V2= 10 km/h dir= Nemo’s home1.Formula CV= V1 - V22. Work CV= 12 km/h - 10 km/h3. Answer CV= 2 km/h on the way home

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