# Observing the motion of an object moving In a circular path in Gravitation – Class 9 Science Experiment

## Activity Name: Observing the motion of an object moving In a circular path in Gravitation

### Activity Description:

In this experiment, we will observe the motion of a small wooden block placed on a disc fixed to the shaft of an electric motor.

By counting the time required for the block to complete ten revolutions, we will investigate whether the time of revolution is constant and whether the speed of the block remains constant during the circular motion.

### Required Items:

• Electric motor with a disc
• Small wooden block
• Stopwatch or timer
• Figure 1 (a) for reference

### Step by Step Procedure:

1. Attach the disc firmly to the shaft of the electric motor.
2. Place the small wooden block at the edge of the disc as shown in figure 1 (a).
3. Switch on the electric motor.
4. Allow a few seconds for the motor to stabilize before starting the counting of revolutions.
5. Start the stopwatch or timer as soon as you begin counting the revolutions.
6. Count the number of revolutions completed by the block until it reaches ten revolutions.
7. Stop the stopwatch or timer as the block completes ten revolutions.
8. Repeat the experiment two to three times to ensure accuracy.

### Experiment Observations:

• Note down the time taken to complete ten revolutions for each trial.
• Record any observations related to the motion of the block during the experiment.

### Precautions:

1. Ensure the disc is firmly fixed to the motor shaft to prevent any wobbling.
2. Use a small wooden block that is lightweight and smooth to reduce friction.
3. Carefully start counting revolutions only after the motor stabilizes to avoid errors in timing.

### Lesson Learnt from Experiment:

The experiment aims to demonstrate the nature of circular motion concerning time and speed. Depending on the observations, learners will understand whether the time taken to complete ten revolutions is constant and whether the speed of the block remains consistent during its circular motion.

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