how far? _________ (d) ______________________________________ to get to the store go 2-miles east,...
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How Far?_________ (d)
____________________________________________________________________________
To get to the store go 2-miles east, turn right and go 3-miles south.
How far will you travel to the store?__________________
Notes on Motion III
How Fast. How Far & How Long
How Far?Units for distance are:
English System
_____________, ______________, ______________
Metric System
_____________, ______________, ______________
In science the most common unit is:
_______________
How Fast?Speed (v)
__________________________________________________________________________________________
Velocity (v)____________________________________________________________________________________________
If you are traveling north at 65-mph.Your speed is : _________
Your direction is : ____________Your velocity is : ____________
How Fast?Average Speed (vavg)
____________________________________________
_____________________________________________
Average Speed is over a _______________.
Instantaneous Speed (v)
___________________________________________
___________________________________________
Your speedometer measures ____________________.
How Fast?Constant Speed (v)
_______________________________________
Constant Velocity (v)_______________________________________________________
Can you have a constant velocity but not have a constant speed?
Can you have a constant speed but not have a constant velocity?
How Fast?Units for speed and velocity:
English System__________________, __________________
Metric System________________________________________,
_______________________________________
In science the most common unit is:
How Long?_______ (t)
Units:
__________, __________, __________, __________,__________
In science the most common unit is:
Solving Problems with Velocity and Speed
In general the equation that relates the speed (or velocity) of an object to the distance it
travels and the time it takes is:
If we need to find the distance from speed and time, we use algebra to solve for d:
If we need to find the time from distance and speed we use algebra to solve for t:
Solving Problems with Velocity and Speed
We can use a triangle to help us remember these formulas.
Solving Problems with Velocity and Speed
dv t
Example Problem 1:
A runner finishes the 100-m dash in 9.4-s. What is the average speed of the runner during the race?
Know: Find:
Formula: Solve:
Solving Problems with Velocity and Speed
dv t
Example Problem 2:
A car travels with a constant velocity north of 45-m/s (100-mph). How far will the car travel in 300-s (5 minutes)?
Know: Find:
Formula: Solve:
Solving Problems with Velocity and Speed
dv t
Example Problem 3:
The circumference of the Earth is approximately 40,000-km. How long would it take you to drive this distance at 320-km/hr?
Know: Find:
Formula: Solve:
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