Lab Setup
What is ok during our car racing labs? There is more than one right answer.
a) Running across the room to get your car
b) Walking beside your car as you drive
c) Driving the car into the wall
d) Asking for help if your car doesn't work
B and D
Graphing #1
What is the difference between speed and acceleration?
Speed describes a constant movement
Acceleration describes an increase or decrease in speed.
Gear Ratio Problem 1
Making Predictions #1
If someone gets hurt during a lab...
Think of two things you Should do and two things you Shouldn't do
1. Stop playing with the car
2. Come see Ms. Baade
3. Check to see that team member is ok
1. Run
2. Keep playing with the car
Graphing #2
If you have driven 50 miles in 5 hrs, what is your speed in miles per hour? Show your work!
S=D/T
S=50/5= 10 miles per hour
Distance/Time Graphing #1
Making Predictions #2
What is a trial?
A trial is one set of data, one time driving the car, one time measuring something
Graphing #3
If you drive a car for 7 minutes and move 91 meters, what is your speed in meters per minute? Show your work.
S = D/T
S= 91/7= 13 meters per minute
Gear Ratio #2
Making Predictions #3
When you collect data (with a stopwatch), is it better to have many trials or only one?
Explain.
It is better to have more trials, because then mistakes or errors in the data will not change all of your results.
Take the average! Keep all your data!
Graphing #4
Fill in the blank: The car's speed is (increasing/decreasing), so this experiment is probably studying
a) gear ratio
b) relationship between distance and time
c) acceleration
Increasing
Acceleration (Why?)
Distance/Time #2
Making Predictions #4