6. Complete Activity 10.6 (Page 117).
• Take a heavy ball. Drop it on a thick bed of sand. A wet bed of sand would be better. Drop the ball on the sand bed from height of about 25 cm. The ball creates a depression.
• Repeat this activity from heights of 50 cm, 1m and 1.5 m.
• Ensure that all the depressions are distinctly visible.
• Mark the depressions to indicate the height from which the ball was dropped.
• Compare their depths.
• Which one of them is deepest?
• Which one is shallowest? Why?
• What has caused the ball to make a deeper dent?
• Discuss and analyse.
Answer:
Aim: To compare the depths of the depressions formed when the ball is dropped from heights 50 cm, 1m and 1.5 m and make the necessary conclusions.
Materials required: Wetbed of sand, heavy ball.
Procedure:
(i) Take the heavy ball to a height of 25 cm and drop it on the wet bed of sand. Note the observations.
(ii) Repeat the activity from heights of 50 cm, 1m and 1.5 m.Note the observations.
(iii) Discuss and analyze the observations.
Observations:
- After dropping the ball from various heights (25 cm, 50 cm, 1 m, and 1.5 m) onto the sand bed, depressions are formed at each impact point. The depressions become deeper as the height of the drop increases.
- It is observed that the depression created by dropping the ball from the greatest height (1.5 m) is the deepest, while the depression from the lowest height (25 cm) is the shallowest.
Conclusions:
The depth of the depression is directly proportional to the kinetic energy of the ball on impact. As the ball is dropped from greater heights, it gains more kinetic energy due to its increased velocity. This greater kinetic energy results in a more forceful impact with the sand, causing a deeper depression.
“• Take a heavy ball. Drop it on a thick bed of sand. A wet bed of sand would be better. Drop the ball on the sand bed from height of about 25 cm. The ball creates a depression.
• Repeat this activity from heights of 50 cm, 1m and 1.5 m.
• Ensure that all the depressions are distinctly visible.
• Mark the depressions to indicate the height from which the ball was dropped.
• Compare their depths.
• Which one of them is deepest?
• Which one is shallowest? Why?
• What has caused the ball to make a deeper dent?
• Discuss and analyse.” – Solved.
Related Links:
Solution to Activity 10.1
Solution to Activity 10.2
Solution to Activity 10.3
Solution to Activity 10.4
Solution to Activity 10.5
Solution to Activity 10.6
Solution to Activity 10.7
Solution to Activity 10.8
Solution to Activity 10.9
Solution to Activity 10.10
Solution to Activity 10.11
Solution to Activity 10.12
Solution to Activity 10.13
Solution to Activity 10.14
Solution to Activity 10.15
Solution to Activity 10.16
Solution to Activity 10.17
Solutions to Chapter 10 Work and Energy
