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1. A runner moving eastward covers a distance of a 100 meters in 10 seconds. What is his velocity?. Given: D= 100 m T= 10s dir= East Formula V= d/t with dir Work V= 100m/10s East Answer V= 10m/s East.
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1.A runner moving eastward covers a distance of a 100 meters in 10 seconds. What is his velocity? • Given: D= 100 m T= 10s dir= East • Formula V= d/t with dir • Work V= 100m/10s East • Answer V= 10m/s East
2.Lisa is walking to a friend’s house. She walks 500m for 10 minutes, then realizes she forgot something important to bring. She turns around, and hurries back to his house. The walk/jog back takes him 5 minutes. a. What was her average speed ? • Given: Total D= 500m + 500m = 1,000m • Total T= 10min + 5 min= 15min • Formula Ave S = total D/total T • Work Ave S = 1,000m/15 min • Answer Ave S = 66.7 m/min
2.Lisa is walking to a friend’s house. She walks 500m for 10 minutes, then realizes she forgot something important to bring. She turns around, and hurries back to her house. The walk/jog back takes her 5 minutes. b. What was Lisa’s velocity (in m/s) while walking to her friend’s house? Given: D= 500m T= 10min dir = forward (to her friend’s house) 1.Formula V= d/t with dir 2. Work V= 500m/10 min to friend’s house 3. Answer V= 50 m/minto friend’s house
T= 10 min D= 500m D= 500m T= 5 min 2.Lisa is walking to a friend’s house. She walks 500m for 10 minutes, then realizes she forgot something important to bring. She turns around, and hurries back to his house. The walk/jog back takes him 5 minutes. Given: Total D= 500m + 500m = 1,000m Total T= 10min + 5 min= 15min
3.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. • What is Nelson’s speed in m/s? Given: d= 800 m t= 180 s running at constant speed
What is Nelson’s speed in m/s? Given: d= 800 m t= 180 s running at constant speed 1. Formula S= d/t 2. Work S= 800m/180s around oval 3. Answer S= 4.44 m/s If Nelson is running at constant speed, is he also moving at constant velocity ? No, he is always changing direction (running around the oval).
4. Nemo is swimming his way to his best friend’s house Crush the Turtle. Nemo is swimming at 12 km/hour 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’scombined velocity on the way to Crush’s house? Given: Nemo V1= 12 km/h dir= to friends house with current current V2= 10 km/h dir= with current 1.Formula CV= V1 + V2 2. Work CV= 12 km/h + 10 km/h 3. Answer CV= 22 km/h with current or to friends house same direction means add
4. Nemo is swimming his way to his best friend’s house Crush the Turtle. Nemo is swimming at 12 km/hour 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’scombined velocity on the way to Crush’s house? Given: Nemo V1= 12 km/h dir= to friends house with current current V2= 10 km/h dir= with current 1.Formula CV= V1 - V2 2. Work CV= 12 km/h - 10 km/h 3. Answer CV= 2 km/h against current or away from friends house same direction means add