2022/23_CHS_Physics Practical PLANNING Notes

1 Name: ( ) Class: 4 - Catholic High School 2023 Level 4 Physics Practical Planning No. Contents Page 1 Singapore-Cambridge General Certificate of Education Ordinary Level (2018) (Syllabus 6091 - Physics) 2 2 Planning Content 4 3 Example 1 – O-Level Specimen Paper 3 (Physics Syllabus 6091) 12 4 Example 2 – Physics Syllabus 5052 Nov 2008 16 5 Practice • Practice 1 • Practice 2 19 22

2 (1) Singapore -Cambridge General Certificate of Education Ordinary Level (2018) (Syllabus 6091 - Physics)

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4 (2) Planning Content Planning questions are generally extension of existing short practical questions. Hence, students will need to be familiar with the procedure outlined in order to answer the planning question. These questions typically require the students to verify a hypothesis or relationship that may be based on an equation. For example, students may have already measured the time taken for a rod to roll down a slope as shown. The planning question may be as follows: EXAMPLE It has been suggested that the distance travelled by the rod along the slope and the time it takes is given by: t2= 2D a where D is the distance rolled down by the rod, t is the time taken for the rod to reach the bottom, and a is the acceleration of the rod along the slope. Plan an experiment to investigate the equation given. In your plan, you should: • identify the constant variables • describe how you will perform the experiment • sketch the graph that you will obtain if the suggested relationship is correct • explain how you will find a from the graph. In the next few sections, we will learn how to answer a planning question using the example above.

5 (A) Identify linear relationship of given equation When the question involves the investigation of an equation, students are expected to recall the standard linear form, y = mx + c They are also expected to rearrange relationships into linear form where appropriate. In general, the independent variable is contained within the expression for x, while the dependent variable is contained within the expression for y (see Section B for more details). EXAMPLE For the equation in the example above, we compare it against the linear form as follows: y = m x + c t2 = 2 a D + 0 Hence, we have y = t2 x = D m = 2 a c = 0 PRACTICE A1 Investigate the relationship between the object distance and image distance for a given lens, given by the lens equation 1 f = 1 u + 1 v where f is the focal length of the lens, u is the distance of the object from the lens i.e. object distance v is the distance of the image from the lens i.e. image distance Rearrange