AIM OF THE EXPERIMENT: To show how energy is exchanged between two coupled pendulums.
MATERIALS: two chairs, a metre-long wooden strip, string, scissors, two washers.
MATERIALS: two chairs, a metre-long wooden strip, string, scissors, two washers.
Изображение
Stand two chairs back to back 1 m apart.
Pull the string taut and tie it to the chair backs.
Cut two pieces of string (60 cm each) and tie a washer to the end of each.
Tie these pieces to the taut string so that they are 30 cm apart.
As shown in the picture, draw the string with weight A aside, up to the level of the chair backs, pulling it slightly taut.
Let the string go.
RESULTS: While the string with weight A swings back and forth, weight B also begins to move. When the weight on one string slows down, the other swings more strongly, then the other way about, and so on several times, until both weights come to rest.
WHY? Washers hanging on a string are called pendulums. The pendulums are attached to a horizontal string. When one pendulum moves, the string moves too and acts on the second pendulum. The amount of energy needed to move the pendulums is passed back and forth along the string that joins them. When energy is transferred, one pendulum slows down and the other gains speed. Sometimes one pendulum stays still because the other has taken all the energy. When both pendulums have the same amount of energy, they have the same amplitude of swing. Because of friction, which is resistance to motion, both pendulums in the end stop moving.
METHOD:
Pull the string taut and tie it to the chair backs.
Cut two pieces of string (60 cm each) and tie a washer to the end of each.
Tie these pieces to the taut string so that they are 30 cm apart.
As shown in the picture, draw the string with weight A aside, up to the level of the chair backs, pulling it slightly taut.
Let the string go.
RESULTS: While the string with weight A swings back and forth, weight B also begins to move. When the weight on one string slows down, the other swings more strongly, then the other way about, and so on several times, until both weights come to rest.
WHY? Washers hanging on a string are called pendulums. The pendulums are attached to a horizontal string. When one pendulum moves, the string moves too and acts on the second pendulum. The amount of energy needed to move the pendulums is passed back and forth along the string that joins them. When energy is transferred, one pendulum slows down and the other gains speed. Sometimes one pendulum stays still because the other has taken all the energy. When both pendulums have the same amount of energy, they have the same amplitude of swing. Because of friction, which is resistance to motion, both pendulums in the end stop moving.
METHOD: