# Be sure there are no objects on the cart the fan

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• Be sure there are no objects on the cart. • The Fan speed should be set Question: How does force affect motion? 1. Run Gizmo: Press Play . What was the final speed of the cart? 90 cm/s 2. Predict: Would the cart’s final speed be higher or lower if the fan were set to Medium instead of Low ? Higher because more force is pushing the cart the higher the fan speed 3. Experiment: Click Reset . Change Fan speed to Medium . Click Play . What was the cart’s final speed? 120cm/s
4. Draw conclusion: Did the cart speed up more quickly with the fan on Low or Medium ?
5. Generalize: On Medium the fan provides more force than on Low . Make two rules by filling in the blanks below. (Put the same word in both blanks.)
6. Predict: Select the DATA tab. Choose Bar graph or Line graph . This graph shows the cart speed over time. How would the graph be different if the fan were on High ? Why?
7. Test: Check your prediction with the Gizmo. What do you observe?