Gizmos Force and Fan Carts

Gizmos Force and Fan Carts

Force and Fan Carts Answer Key
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?
The cart speeds up.
2. What happens to a shopping cart if you get it rolling and then release it?
The cart continues rolling, gradually coming to a stop. [You may want to point out that the
cart does not come to a screeching halt just because you stop pushing it.]
Gizmo Warm-up
1. In the Gizmo, turn the fan Off. Click Play ( ). Did the cart move? No, it did not move.
2. Click Reset ( ). Press the Low fan speed button to
turn on the fan. Click Play. What happened?
The cart began moving to the right.
3. A force is something that causes change in motion.
What provided the force that made the cart speed up?
The fan provided the force. [Really, it’s air particles. The fan
pushes the air, which in turn pushes the fan.]
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?
122.7 cm per second [This assumes the initial Gizmo settings—metal surface, no objects.]
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?
134.3 cm per second 

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