Black Board Pendulum

Mobile black board with a horizontal line drawn on it; pendulum with a ball on the end is attached via magnet.

Concept Overview:

1. Conservation of Energy

Lecturer Procedure

Step(s) to Follow	Expected Result
1. Pull the ball back so that it is even with the line. 2. Release the ball. 3. Note the height that it swings to.	The ball will rise almost to the same height it was released from.
1. Place a peg beneath the point from which the ball is suspended. 2. Repeat steps 1-3 above.	The ball's path will be interrupted by the peg, but the ball will still rise to almost the same height it was released from.

Step(s) to Follow

Expected Result

1. Pull the ball back so that it is even with the line.

2. Release the ball.

3. Note the height that it swings to.

The ball will rise almost to the same height it was released from.

1. Place a peg beneath the point from which the ball is suspended.

2. Repeat steps 1-3 above.

The ball's path will be interrupted by the peg, but the ball will still rise to almost the same height it was released from.