7
Experiments Using the Vernier Photogate
The Vernier Photogate is used in several experiments in the book Physics with
Vernier published by Vernier Software & Technology. See this book for detailed
experiments. Here are some brief examples of things you can do with a photogate.
1. If you know the diameter of a ball rolling through a photogate, you can
determine the speed of the ball from the ratio of the diameter to the time the
gate is blocked by the ball. This requires only one gate, but the gate has to
be positioned carefully so the light beam intersects the middle of the ball.
2. Using two photogates positioned at a known separation, you can determine
the speed of an object from the time interval between the breaking of the
first beam to the breaking of the second. This mode is known as pulse
timing.
3. Set up a pendulum so that the bob swings through the photogate. The time
interval from one block to the third block yields the pendulum period.
4. Use the laser gate at floor level to measure the “hang time” of a jumper.
The jumper’s shoes will block the beam while on the floor. The time
interval of interest is then the unblock to block time.
5. Use a super pulley to construct an Atwood’s machine, consisting of two
masses connected by a flexible string. The string passes over the pulley,
causing it to rotate as the masses move. Use motion timing to measure the
position, velocity, and acceleration as a function of time.
6. Measure the free fall acceleration of a picket fence using either the internal
gate or the laser gate. Motion timing will give you the position, velocity,
and acceleration as a function of time. Do the two modes give different
results?
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does not cover damage to the product caused by abuse or improper use.
8
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(4 Seiten)
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