NCERT Based Activity: Exploration : Entering the World of Secondary Science

Activity 1.1 : Let us model

Suppose you ride a bicycle from your school to your home. You want to model the time it takes to go home from school.

What details would you keep? What details could you ignore?

Suggest why ignoring some details may actually be useful.

What is a Model?

Science uses models - simplified ways of looking at real systems that focus only on what is most important for a given question. Building models involves making assumptions and deliberately ignoring certain details. These choices are not mistakes; they are done on purpose to keep things simple enough, but still allow us to find answers to what we are looking for.

Details to Keep

• Distance from school to home - directly affects travel time.
• Speed at which you ride the bicycle.
• Road type - flat, uphill, or downhill - affects effort and speed.
• Traffic lights / stops that slow you down significantly.

Details to Ignore

• Colour of the bicycle - has no effect on travel time.
• Brand of the bicycle - not relevant to speed in a simple model.
• What you are wearing - does not significantly change travel time in a basic model.
• Exact number of pedal strokes - too detailed for the purpose of this model.

Why Ignoring Some Details May Actually Be Useful

Ignoring unnecessary details makes the model simpler and easier to work with. If we tried to include every possible factor, the model would become too complicated to use or understand.

A simpler model allows us to focus on the most important relationships - in this case, how distance and speed together determine travel time.

Scientists deliberately simplify in order to test ideas clearly. For example, when studying the motion of a falling object, air resistance may be ignored to first understand the basic effect of gravity. Once the basic idea is understood, more details can be added gradually to make the model more accurate.

Conclusion

A good scientific model keeps only the details that matter for the specific question being asked. By ignoring the rest, it becomes a powerful tool for understanding, predicting, and explaining how the world works.

This activity shows that modelling is a key scientific skill used across all branches of science - physics, chemistry, biology, and earth science - to make sense of complex real-world situations.