Understanding potential energy in Work And Energy – Class 9 Science Experiment
Chapter Name: Work And Energy
Activity Name: Understanding potential energy in Work And Energy
Activity Description:
In this experiment, we will investigate the concept of potential energy by using a bamboo stick to make a bow and an arrow.
By stretching the bowstring and releasing the arrow, we will observe the differences in the motion of the arrow under two conditions: when the string is gently stretched and when it is stretched with more force.
Required Items:
- Bamboo stick
- Light stick (for the arrow)
Step by Step Procedure:
- Take the bamboo stick and bend it to form a bow shape, as shown in Figure 13 (a).
- Place the light stick arrow on the bow with one end supported by the string.
- Gently stretch the string and release the arrow. Observe the motion of the arrow.
Experiment Observations:
- The arrow separates from the bow and falls to the ground when released with gentle stretching of the string.
- When the string is stretched with more force, the arrow flies with greater speed into the air.
Precautions:
- Be cautious while stretching the bowstring and releasing the arrow to avoid any accidents or injuries.
- Use a light stick for the arrow to minimize potential risks.
Lesson Learnt from Experiment:
The experiment demonstrates that the bow in its normal shape is not able to impart enough force to the arrow to launch it effectively. However, when the bowstring is stretched by applying more force, it acquires energy, allowing it to throw the arrow with greater speed and height. The energy acquired by the bow due to the change in its shape (stretching of the string) is known as its potential energy.
