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- The SpillNot allows for rapid, spill-less, acceleration of a liquid-carrying container.
- Place cup on flat base and carry gadget by flexible loop handle.
- Rapid turns and sudden changes in motion should produce no spilling.
- Practice before use in class.
- Located in L02, section B2.
- Ball can be used to measure the free-fall time of an object.
- Release of a button on ball’s face starts a digital timer. Timer automatically stops upon collision.
- Please use a landing cushion, such as the styrofoam pad shown above, to prevent the risk of cracking face of digital timer.
- Toy cars exhibit linear acceleration.
- Cars use windup mechanism for propulsion.
- Located in L02, section B1.
- Hold both ends of the chain- one end in each hand- so that the chain hangs freely and forms a U shape.
- When one end of the chain is released it accelerates toward the ground faster than g. To prove it, drop an object simultaneously with the chain end, and listen to hear which one strikes the ground first.
- Requires standing on ladder.
- Chain located in L02, section B3. Plastic balls in section A2.
- Show that a penny and a feather fall at the same rate in
a vacuum.
- Feather tends to stick to the walls of the container (static cling). Use styrofoam pieces instead.
- Located in L02, section B2- top shelf, in large plastic container. Pump located in L02, section D1.
- Measure the drop time of a small plastic ball (or any object
that isn’t so heavy that it damages the force plate upon impact).
- The Pasco force probe is located 1 or 2 meters above the
floor, suspended by a ring stand, oriented with the force sensor pointing
down. A small plastic ball is pressed lightly up against the sensor and then
released. The ball lands on the force plate, resting
on the floor, directly beneath the force probe. The event is graphed using
logger pro, (in the picture above, the top graph is that of the force probe,
and the bottom the force plate). The moment of release and moment of impact are indicated on the two logger pro graphs. Time measurements are only accurate to
.02 seconds.
- Force probe and labpro device is located in L35, section
B2. Force plate is located in L02 section B3.
- Note: You might think that a photogate would
be the more effective and convenient way to measure the release time. But
for some reason, when the photogate is used drop times are consistently measured
to be .04 seconds too short. Which amounts to about 10% error.
- Inclination of flame indicates direction of acceleration.
Spinning around while holding flame results in a radially inward flame inclination.
- Candle protrudes through card board. Light candle, then place
glass lamp cover over candle. Place card board piece on top of lamp cover
to shield flame from wind. If flame starts to die, remove top cover.
- Located in L02, setcion B-1.
- When plastic container is moved, inclination of ping-pong
ball indicates direction of acceleration. Use with rotating stool to demonstrate
radially-inward direction of centripetal acceleration.
- Located in L02, section D2.
