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# Chapter 1 science form 4

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### Chapter 1 science form 4

1. 1. Importance of Scientific Investigation Method
2. 2. Variables and Hypothesis • Three variables: • Manipulated : is changed (we change the value/quantity) • Responding : changing • Constant : kept constant • Hypothesis: relationship between manipulated and responding variables.
3. 3. Examples of hypothesis: • You change the temperature of water to see if there is any changes to the volume of water. • Hypothesis: • The more temperature, the less volume of water.
4. 4. Answers: 1. a) i. The temperature ii. Rate of photosynthesis b) The higher the temperature, the higher the rate of photosynthesis.
5. 5. Answers: 2. a) i. The length of thread ii. Time taken iii. Type of pendulum/number of oscillation b) The longer the thread, the longer time take to oscillate.
6. 6. Answers: 1. a) i. The weight of load ii. Length of spring iii. Type of load/ spring b) The heavier the load, the longer the spring. c) Hypothesis is accepted. The heavier the load, the longer the spring.
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