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Car and Ramp Lab . 8 th Grade Science. What is a Photogate ?. A device that can be used to accurately measure periods of time. When an object passes through a light beam, it starts/stops a timer. It’s much more effective then trying to manually keep time. Before Each Trial.

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## Car and Ramp Lab

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**Car and Ramp Lab**8th Grade Science**What is a Photogate?**• A device that can be used to accurately measure periods of time. • When an object passes through a light beam, it starts/stops a timer. • It’s much more effective then trying to manually keep time.**Before Each Trial**• Hit “reset” on the Photogate • Make sure both the “A” and “B” lights are on.**Today’s Jobs**• A- Ramp (stack the books, measure the height) • B - Car (release and catch) • C - Photogate (reset, push buttons) • D - Manager (reader/recorder)**When you finish collecting data..**• Head back to your seats. • Have your manager get calculators for the group. • Calculate your averages for each height. • Use the average to calculate your average speed. Remember! Speed=Distance/Time

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