Starter 10/7-8 reference 2 units W (or -2) 2 units W (or -2) 8 units

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Presentation transcript:

Starter 10/7-8 reference 2 units W (or -2) 2 units W (or -2) 8 units The starting position is known as the point. An object moves 5W (or -5) then 3E (or +3). Where is the object compared to its reference? What is the displacement of the object in #2? What is the distance the object traveled in #2? What would the speed be if the distance in object #4 was in mile and took 8 min? reference 2 units W (or -2) 2 units W (or -2) 8 units 1mi/min

Speed

What do we know? Can’t move unless you give a reference position Problems are much easier if you draw them out If 2 people have different reference points, they see different events

Speed Speed = distance time UNITS- meter/second (m/s) d=s  t d s t  ÷ t =d ÷ s Speed = distance time UNITS- meter/second (m/s) kilometer/hour (km/h) feet/second (ft/s)

Different speeds? Constant speed = speed that doesn’t change (cruise control) Instantaneous speed = speed at a given time

÷ ÷ Average Speed d s t  Calculate average speed Final minus the initial Total distance traveled Total time traveled d s t ÷ ÷ 

Distance or Speed? 1. Miles Distance

Distance or Speed? 2. Feet/second Speed

Distance or Speed? 3. ft/s Speed

LY (lightyear) distance light travels in 1 year Distance Distance or Speed? 4. LY (lightyear) distance light travels in 1 year Distance

Distance or Speed? 5. m/s speed

Distance or Speed? Yards Distance

Distance or Speed? cm Distance

Distance or Speed? 6. cm/hr Speed

What is the speed of an object that travels 5mi in 10 hours? Speed Time! 7. What is the speed of an object that travels 5mi in 10 hours? 5mi/10hr = 0.5mi/hr

What is the speed of an object that travels 10mi in 5 hours? Speed Time! 7. What is the speed of an object that travels 10mi in 5 hours? 10mi/5hr = 2mi/hr

What is the speed of an object that travels 1mi in 10 hours? Speed Time! 8. What is the speed of an object that travels 1mi in 10 hours? 1mi/10hr = 0.1mi/hr

What is the speed of an object that traveled for 15 seconds over 5m? Speed Time! 9. What is the speed of an object that traveled for 15 seconds over 5m? 5m/15s = 0.3m/s

What is the distance of an object that traveled 5m/s in 10s? Speed Time! 10. What is the distance of an object that traveled 5m/s in 10s? 5m/s ×10s = 50m

What is the distance of an object that traveled 10mi/s in 10s? Speed Time! 11. What is the distance of an object that traveled 10mi/s in 10s? 10mi/s ×10s = 100mi

What is the speed of an object that traveled for 100hr over 500mi? Speed Time! 12. What is the speed of an object that traveled for 100hr over 500mi? 500mi/100hr = 5mi/hr

What is the time an object traveled if they went 5mi/hr over 20mi? Speed Time! 13. What is the time an object traveled if they went 5mi/hr over 20mi? 20mi / 5mi/hr = 4hr

Speed Time! 14. An object traveled in a circle of 100m. It took the object 100s. What is the speed of the object? 100m / 100s = 1m/s

Practice A runner left his house and ran 8 km West, 5 km North, and 1 km East. Explain how he can get back to his house the quickest. 7 km East & 5 km South

Practice A runner left his house and ran 5 km West, 10 km North, and 1 km South. Explain how he can get back to his house the quickest. 5 km East & 9 km South

Conclusion Support Groups of 3 support Speak, Write, & Question Data included Supported/rejected Switch to right