Sager International School Grade 9 Physics Worksheet 1 PDF

‫مدارس الصقر العالميـــــة‬ ****- SAGER INTERNATIONAL SCHOOL Honor - Pride - Excellence GRADE: 9 SUBJECT: PHYSICS...

‫مدارس الصقر العالميـــــة‬ ****- SAGER INTERNATIONAL SCHOOL Honor - Pride - Excellence GRADE: 9 SUBJECT: PHYSICS WORKSHEET 1 MODULE 1-A PHYSICS TOOLKIT LESSON 1 METHODS OF SCIENCE (Textbook pages 4-9) 1. Summarize the steps you might use to carry out an investigation using scientific methods. 1. State the problem 2. Gather information 3. Form and test a hypothesis 4. Analyze the data 5. Draw conclusions. 2. Define the term hypothesis and identify three ways in which a hypothesis can be created. A hypothesis is a possible explanation for a problem using what you know and have observed. You can test a hypothesis through experimentation, observation or investigation. 3. Describe why it is important for scientists to avoid bias. Bias can affect the results or conclusion of an investigation, making them invalid. 4.Why do scientists use models? What is an example of a scientific model? They use models because sometimes they can't see everything they are testing. E.g. atomic model, solar system model. 5. Your friend finds that 90% of students surveyed in the cafeteria like pizza. She says this scientifically proves that everyone likes pizza. How would you respond? Testing opinions are not scientific. It is impossible to prove that an opinion is true for everyone. In addition, the survey was based on a small part of the population and it included students at one school. The results cannot be extended to the entire population. 6. An accepted value for the acceleration due to gravity is 9.801 m/s2. In an experiment with pendulums, you calculate that the value is 9.4 m/s2. Should the accepted value be tossed out to accommodate your new finding? Explain. 1  No, the value of 9.8 m/s2 has been established by many other experiments, and to discard the finding you would have to explain why it is wrong. Other factors affecting calculation are friction or how precisely the variables are measured. 7. Why can't a scientific theory become a scientific law? A scientific theory is an explanation of things or events based on knowledge gained from observations and investigations. A scientific law is a statement about what happens in nature and seems to be true all the time. A theory can be used to explain a law, but theories do not become laws. 8. Why are concepts in physics described with formulas? It is one way of representing relationships between measurements. 9. You perform an experiment to determine how many breaths a fish takes per minute. Your experiment yields the following data: minute 1:65 breaths , minute 2:73 breaths, minute 3:67 breaths, minute 4: 71 breaths, and minute 5: 62 breaths. Calculate the average number of breaths that the fish takes per minute. 65+73+67+71+62 / 5 = 67.6 10. Discuss how computer simulations can help develop possible solutions to a problem. It helps in simplified representation of a complex system or process used for analysis, prediction, and understanding of real-world phenomena. Choose the correct option for the following statements. 1. If scientists’ results support hypothesis, it is a. scientific law b. scientific theory c. experiment d. model 2. Choose the wrong option. Functions performed by the hypothesis are: a. Hypothesis helps in directing the inquiries in the right direction b. Hypothesis does not help in verifying the observations c. It helps in making an observation and experiments possible d. It becomes the starting point for the investigation Explanation: Hypothesis helps in verifying the observations. 2 3. A hypothesis cannot be proved or disproved by doing one experiment. a. True b. False 4. Which of the following is not a step of the scientific method? a. report your conclusions b. prove your hypothesis c. perform experiments d. make an observation 5. Which best describes how computer simulations are used in science? a. computer simulations help scientists see very large objects. b. computer simulations help scientists see very small objects. c. computer simulations help scientists predict future events. d. computer simulations help scientists map unexplored places. 6. A process that takes place before a study is published to ensure that the research is of a high quality, contributes to the field of research and is accurately presented is a. model b. theory c. hypothesis d. peer review 3