Connect the sensor following the steps in the Getting Started section of this user manual.
Go Direct Sensor Cart has five measurement channels. The channel names are
- X-axis acceleration
- Y-axis acceleration
- Z-axis acceleration
The default channel that is active when the cart is first connected is position. Graphical Analysis calculates velocity and acceleration data from the position information. The position reading changes as the encoder wheel turns. If the cart is picked up and moved to a different location without rolling the encoder wheel, the position reading does not change. The behavior is like the mouse on a computer.
The default channel that is active when the sensor is connected is force. The force channel measures pushes and pulls along the main axis of the sensor body. Use the hook attachment for pulling and the bumper attachment for pushing. Pulls are registered as positive forces and pushes are registered as negative forces, unless sensor readings are reversed in Graphical Analysis 4.
Do not twist or remove the hex barrel of the force sensor. Removal will damage the load cell.
There are three acceleration channels, measured by a single chip, which is located under the 3-axis icon on the label. The icon shows the positive direction for each axis, with the x-direction of acceleration parallel to the pulling force on the force sensor and the z-direction straight up through the label. Each direction of acceleration can be measured separately.
If you choose to activate all three acceleration channels at once, you can create a calculated column for the total acceleration magnitude.
Track Usage Notes
The Sensor Cart can be used with or without a track. Using the cart on a tabletop or floor allows very easy experiment setup, but a track allows more careful experiments, including collisions, to be performed.
The Sensor Cart is compatible with many common dynamics tracks, including the Vernier Combination 1.2 m Track and Optical Bench.
The cart includes an anti-roll peg. The peg rides in the center groove of a Vernier Track, allowing the cart to roll freely. When the cart is placed on a table, the peg keeps the cart from rolling. If you want to use the cart on a table or floor, remove the peg by pulling and twisting.
The cart includes a spring-loaded plunger for collisions. To use the plunger, simultaneously press the horizontal button above the plunger and press the plunger in until it locks. To release, press on the pin from the top of the cart. The plunger force can be adjusted. To adjust the plunger release force, rotate the plunger while it is extended. An uncalibrated scale is visible on the underside of the cart. Use this scale to return to a previous setting. The plunger cart is capable of superelastic collisions. To enable this mode, use a small screwdriver to unlock the dark gray plastic plug below the main plunger. Depress the plug using the screwdriver and rotate one-quarter turn counterclockwise to unlock. The plug will extend about 2 mm. Lock the plunger as before to prepare for a superelastic collision. In a collision, the plug will strike first and trigger the release of the plunger. To disable superelastic collision mode, use a small screwdriver to depress and rotate the plug one-quarter turn clockwise. It will lock in the flush position.
Available Sensor Cart Accessory Kit (order code GDX-CART-AK)
An accessory kit for the Vernier Go Direct Sensor Cart is available. The kit is recommended for more advanced users. It includes
- Hoop spring bumper (heavy)
- Hoop spring bumper (light)
- Magnet tabs (4)
- Hook-and-pile tabs (4 pair)
- Masses (4 hex)
- Magnetic disk bumper for force sensor (2)
- Additional metal hook and nut for force sensor (3)
- Additional flat-top rubber bumper (3)
- Additional anti-roll pegs (3)