Crown Car: A crown gear lets you change the direction of motion by 90 degrees. Build a car using a crown gear so that two of your wheels are powered by the WeDo motor and the other two spin freely.
For information about using crown gears, watch the Gears Snippet.
For your two free-spinning tires, you can use two of the light green round bricks.
Bald Tires: Try running your car two ways, with the yellow bands around the freely spinning tires and without the yellow bands. How does the motion of the car change?
Try running your car on different surfaces. How is the motion affected?
Time and Distance: Test how far your car travels in one second (ten units in the WeDo program, since time there is measured in tenths of a second). How far do you think it will travel in two seconds? Five seconds? Make predictions and then run your car to test them.
Try running your car for five seconds with and without the yellow bands on the tires. Does it travel the same distance each way?
Bus Stop: The bus stops are 20 centimeters (8 inches) apart. Can you program your car to stop at each one?
To help you figure out how long it takes the car to reach a particular spot,try using this timer program:
Don’t Hit the Wall: Use the motion sensor to detect the presence of a wall in front of your car and program the car to stop before it hits the wall. What is the farthest distance from the wall that the sensor can detect? The closest distance?