Chapter 1 The science of Physics

Chapter 1-your syllabus should be in your binder and labeled as Day 1. Take out a sheet of paper label it Day 2. Copy down the Objective and Warm-Up. Then answer the Warm-Up. You have 5 min. Objective Review the scientific method Review and Introduce SI Units Practice Dimensional Analysis, sig figs, and scientific notation Differentiate between accuracy and precision Warm-Up: What does physics mean to you? Where can you experience physics or see physics? Buddy Check

Physics is everything around you

The Scientific Method -Remember to CONTROL the experiment you must test only one variable at a time. -Models are created to test an experiment or to support a conclusion both.

System : aerodynamics Model: is the car Scientist realize that wind affects a racecar. Perhaps you want to increase the grip of the car on the track without increasing the weight of the actual car. You made your observation, create a hypothesis and then create your car model to test in the Wind Tunnel. You conclude that a light weight spoiler will do what you want.

On board Symbols SI Units- page 15 (1, 2, 4, 5) Dimensional Analysis-ppt Accuracy v Precision-ppt Sig Figs-Pacific/ Atlantic Rule-ppt Scientific notation- ppt

Dim. Anal g to mg g to kg microL to ml

Exit Ticket If a radio wave has a period of 1micro sec, what is the wave’s period in sec? A Hydrogen atom has a diameter of about 10nm. Express this diameter in the following: – Meters – Millimeters – micrometers

Chapter 1 Objective Review the scientific method Review and Introduce SI Units Practice Dimensional Analysis, sig figs, and scientific notation Differentiate between accuracy and precision Warm-Up: Would you rather be accurate or precise on your measurements? Explain. Are they the same thing?

Dim An Review 6.20 mg to kg 3 x s in ms 88.0km in meters

Exit Ticket Which SI units would you use for the following measurements? – Length of a swimming pool – The mass of water in a pool – The time it takes a swimmer to swim a lap

Chapter 1 Objective Review the scientific method Review and Introduce SI Units Practice Dimensional Analysis, sig figs, and scientific notation Differentiate between accuracy and precision Warm-Up: Is the “.00045” significant in the problem? Does it change the overall value?

Exit Ticket Convert: – – 1492 – – – 6022

Chapter 1 Objective Review the scientific method Review and Introduce SI Units Practice Dimensional Analysis, sig figs, and scientific notation Differentiate between accuracy and precision Warm-Up: x x x x 10 -4

Exit Ticket None

Chapter 1 Objective This lab will review: – the scientific method – SI Units – accuracy and precision – Sig figs Warm-Up: What are the SI units for mass, and volume? What is the formula for density?

-Units - How to use it

-units -water displacement -meniscus

Density Lab Observation: You notice that water has mass and volume. Hypothesis: If water has mass and volume then it must have density. The density of water is (less than 1, more than one, equal to one). Materials: triple beam balance, graduated cylinder, water Procedure: Write a procedure (in step format) that allows you to independently measure the mass and volume of water. Perform your experiment 5 times, with 5 different volumes. Data: make a table of your observations. Don’t forget to include labels and units. Analysis: Draw a graph that represents you data. Label each axis and include units. Think about the independent variable and dependent variable. Conclusion: 1.What is the density of water in YOUR experiment? Include all 5 trials, units and proper sig. figs. 2.What is the actual density of water? You may have to look this one up. 3.Explain why density is equal to the slope of your graph. You can use math to help. 4.Analyze your density for each trial and conclude if they are accurate. Explain 5.Are the precise? Explain. 6.Calculate your percent error. Circle one