# If you are pushing a shopping cart and you start pushing...

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Student Exploration: Force and Fan Carts Vocabulary : force, friction, position, speed Prior Knowledge Questions (Do these BEFORE using the Gizmo.) 1. If you are pushing a shopping cart and you start pushing harder, what happens?
2. What happens to a shopping cart if you get it rolling and then release it?
Gizmo Warm-up 1. In the Gizmo™, turn the fan Off . Click Play ( ). Did the cart move?
2. Click Reset ( ). Press the Low fan speed button to turn on the fan. Click Play . What happened?
3. A force is something that causes change in motion. What provided the force that made the cart speed up?
4. The speedometer shows the cart’s speed , or how fast it moves. A speed of 30 cm per second means the cart moves 30 cm every second. What was the final speed of the cart?
5. Friction is a force that works against motion as surfaces rub each other. Click Reset . Select the No Friction surface. Click Play . What was the final speed this time?
Activity A: Force and motion Get the Gizmo ready : Click Reset . Change the Surface to Wood . Be sure there are no objects on the cart. The Fan speed should be set to Low .