Science Experiments Introduction T

This experiment examined 2-dimensional motion with acceleration along only one axis of the motion. It observed the trajectory of a puck under the influence of gravity gliding on a flat table, tilted slightly to provide a component of weight down the plane. The table used was a spark table and the puck was floating on a cushion of air.

An air compressor provided a stream of air through a hollow hose connected to the puck, and the air exited through the base of the puck, providing a thin layer of air between the puck and the table, almost eliminating friction. A high-voltage source was connected to the table and to a fine chain going through the hollow tube and connected to the puck. This caused a periodic high voltage between the puck and the metal surface of the table, causing a spark each time the voltage was turned on. A piece of carbon paper was placed on the table, and a piece of black newsprint above it. The puck rode on the surface of the newsprint. Every 0.100 seconds, there was a brief pulse of voltage, causing a spark between the point on the bottom of the puck and the table, and penetrating the carbon paper and newsprint, leaving a carbon deposit on the newsprint.

A vertical was established by holding the puck near the top of the table and simply letting it go. It fell straight down, and the resulting straight line was used as a reference. The points

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ts of acceleration were a horizontal velocity of 9.9 cm/s and a vertical acceleration of 8.1 cm/s, the weight of the puck, gravity, and the angle of tilt of the table. Experiment 4 - Energy Conservation: A "Bow and Arrow" Experiment Introduction This experiment was carried out to observed the conversion of potential energy to kinetic energy and use the information to predict the height of a projectile. A weight hung over a spring stretched between two dowels and pulled down, pulls the spring down, doing work on the spring and giving it potential energy. When the weight is let go, the potential energy in the spring is decreased, and corresponds to work done on the weight, lifting it upwards, and returning the spring to its original position. This is the same principle as launching an arrow from a bow. Materials - a block of wood with two dowels projecting - a spring which is stretched between the tops of the dowels - a weight hanger and six large washers with the measured mass of each marked on them - a small, U-shaped piece of iron with the mass marked on it Procedure The potential energy of the spring was determined by plotting a graph of force as a function of distance. The area under the curve was equa

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