- Inclined track
- A ball
- A metronome / Clock
- Strobe light
- Make an inclined plane of about 50 cm length with 2 – 3 cm height at the raised end. Alternately, one can use a double inclined track apparatus and make the inclined plane by joining its two arms at the base strip so that these form a single plane. Give it a low inclination by raising one end of the base strip by about two cm with the help of a wooden block, or a book, etc.
- Make 4 groups of 3-4 students each.
- Take a metronome. Let it produce sound signals at intervals of ½ seconds. In the absence of a metronome, let a person tap on the table at a steady pace which synchronises with extreme positions of the pendulum of a clock.
- Keep the ball at the higher end of one of the inclined planes.
- Release it at any signal (which may be called 0th signal) and observe its position at 1st, 2nd, 3rd and 4th signals after the release. Let the students in group I observe the 1st position of the ball, group II the 2nd position of the ball, and so on.
- Now you have obtained as many observations for each position of the ball as the number of students in each group.
- Record the observations.
- Find the mean value of distance covered by the ball in each case.
The distances covered by the ball in successive intervals of ½ second go on increasing by equal amounts when the ball roll down the incline.
The ball moving on an inclined track covers successively longer distances in equal intervals of time. This shows that the speed of the ball increases as it moved down an inclined track.