Oneone SK-19 Objective: To calculate the total amount of energy of a falling object in order to determine when the amount of energy is the greatest. Core.

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Kinetic and Potential Energy

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Presentation transcript:

oneone SK-19 Objective: To calculate the total amount of energy of a falling object in order to determine when the amount of energy is the greatest. Core Question: What happens to the total energy of an object as it falls? Drill: 1. Get a ditto from the SET. 2. Read the problem and write hypothesis

oneone SK-19 Problem: How does the height of a falling object affect it total energy? Hypothesis: If the height of a falling object decreases, then the total energy of the object ______ because _______________________.

oneone SK-19 THINK: When an object falls, it accelerates at 9.8 meters per second per second (9.8 m/s 2 ). This means that every second its velocity increases by 9.8 m/s. What is the initial velocity of an object that is dropped? 0 m/s

oneone SK-19 SCENARIO: A 10 kg object is dropped from a height of 40 m. Calculate the total energy of the system each second as the object falls.

oneone SK-19 Calculate the weight of the object using proper form. Weight = Mass × Grav. Acceleration Weight = 10 kg × 9.8 m/s 2 Weight = 98N

oneone SK-19 EXPLORE: Let’s complete the first line together. (Use a pencil.) Formulas: Kinetic Energy = ½ (mass x velocity 2 ) Grav. Pot. Energy = Mass x Grav. Acceleration x Height Grav. Pot. Energy = Weight x Height

oneone SK-19 Total Energy of a Falling Object Time (s) Height (m) Velocity (m/s) Weight (N) Mass (kg) Kinetic Energy (J) Potential Energy (J) Total Energy (J)

oneone SK-19 Objective: To calculate the total amount of energy of a falling object in order to determine when the amount of energy is the greatest. Core Question: What happens to the total energy of an object as it falls? Drill: 1. Take out yesterday’s ditto. 2. Get a new paper from the SET. 3. Complete the Drill.

oneone SK-19 Look over yesterday’s lab. Think carefully about the scenario and our first line of data. Are there any problems that you can identify?

oneone SK-19 Formulas for the distance an object falls D = v 0 t + ½ g t 2 D = ½ g t 2 (if object is dropped from rest -- v 0 = 0 s) D – distance an object has fallen v 0 -- initial velocity g – gravitational acceleration 9.8 m/s 2 t – time the object has fallen

oneone SK-19 INITIAL HEIGHT = 78.4 m t= 0s D = 0 m Height = 78.4 m t= 1s D = 4.9 m Height = 73.5 m t= 2s D = 19.6 m Height = 58.8 m t= 3s D = 44.1 m Height = 34.3 m t= 4s D = 78.4 m Height = 0 m

oneone SK-19 Total Energy of a Falling Object Time (s) Height (m) Velocity (m/s) Weight (N) Mass (kg) Kinetic Energy (J) Potential Energy (J) Total Energy (J)

oneone SK-19 WRITING A CONCLUSION Every lab that is done should end with a well- written conclusion. A conclusion is purely scientific and is based only on the data collected in the lab. It is not important who performed the lab. Therefore no personal pronouns should be used when writing a conclusion.

oneone SK-19 WRITING A CONCLUSION Each conclusion should meet the following criteria. The problem statement should be restated. The hypothesis proposed is stated. The reasoning need not be given. Evidence is provided to support or refute the hypothesis. This should be the actual lab data that was collected. A single statement summarizing the results of the lab should be provided. THIS IS YOUR CONLUSION AND ANSWERS THE MAIN LAB QUESTION. There should not be support contained within this statement.

oneone SK-19 WRITING A CONCLUSION Write a proper conclusion for this lab. Include: Restatement of the problem Statement of the hypothesis (Do not include “because…”) Support/Reasoning for the conclusion (must use lab data) Summary statement (actual conclusion)

oneone SK-19 HOMEWORK Complete lab