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What are the features of questions requiring Theoretical Explanation?

Explore theoretical explanations in physics by analyzing scenarios on highway safety, gas pressure, and water rockets. Understand the application of physics theories through practical examples.

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What are the features of questions requiring Theoretical Explanation?

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  1. What are the features of questions requiring Theoretical Explanation?

  2. The figure shows a horizontal straight highway with a speed limit of 100 km/h (i.e. 27.8 m/s). For safety reasons, drivers are advised to maintain a safety distance of 80 m from the car ahead. Large arrows (chevrons) are painted on the highway (each at 80 m apart) and road signs are set up to remind drivers of this safety distance. Suppose the highway in the figure is on a slope with traffic running downhill. Do you think the distance between two arrows should be greater than, equal or less than 80m? By considering the forces acting on a car, or otherwise, explain your answer. Assume that the speed limit of the highway and the braking force on the car remain unchanged.

  3. A student uses the set-up as shown to study the relationship between the pressure and volume of a fixed mass of gas at constant temperature. The piston is pushed in or pulled out to vary the volume of gas and the corresponding pressure is measured by the Bourdon gauge. Explain, in terms of the kinetic theory of gases, the increase in the pressure of the gas when the volume decreases at a constant temperature.

  4. Figure 3 shows a water rocket. The rocket is filled with water and compressed air. Explain why the rocket rises when the trigger is pulled and name the law or principle involved. (Source: HKEAA CE 2004 Q2)

  5. Source: HKEAA DSE 2013 Q1 Sometimes it may not mention the word “theory”

  6. Theoretical Explanation • Common vocabulary you may find in questions • Use …… theory to explain …… • In terms of ……, explain why…… • Explain Requirements: To explain why the phenomenon happens relating to physics theories, principles or laws. It puts special emphasis on the relationship between the observations and physics theories/principles/laws.

  7. Theoretical Explanation Writing Genre Structure and language features

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