27-03-2012, 03:49 PM
The Car and Ramp
Car and Ramp Long.ppt (Size: 867 KB / Downloads: 87)
Key Questions
How do we measure and describe the world around us?
What is speed and how do we measure it?
Can you predict the speed of the car at any given point on the ramp?
CPO Timing System
How can we measure time accurately?
Using the timer in stopwatch mode; Who can get the fastest time?
The 100 meter race
One runner has a time of 10.01 seconds
Another runner has a time of 10.00 seconds
Who wins?
Photogates
How does the Photogate start and stop the timer? Do the speed challenge.
What happens when you block the light beam several times in succession; does the timer reset, or does it add the times?
Plug the second photogate into the B port.
Ramp Height
Design a quick experiment to see what effect ramp height has on the TIME it takes the car to move from Photogate A to Photogate B.
Technique
Practice your drop technique until you get three identical times in a row! This is very important for data collection in the next investigation!
Summary
In many situations, like the car/ramp, the distance, speed, time, and acceleration are all important variables.
We know how to relate speed, distance, and time s = d/t; but without acceleration.
We know how to relate speed, time, and acceleration a = (Vf –Vo)t; but without distance.