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Unbalanced Forces and Motion: TEKS 8.6A To the teacher: This CPO Science PowerPoint presentation is designed to guide you through the process of presenting the lesson to your students. The presentation uses a 5-E teaching model: Engage, Explore, Explain, Elaborate, and Evaluate. The PowerPoint Slide notes indicate where you may want to bring in various lesson elements such as quizzes, readings, investigations, animations, and practice materials. Additional science background information is provided in the slide notes where appropriate. You can view these notes by selecting “View,” then “Normal.” You will see the notes pane at the bottom of the PowerPoint workspace. Additionally, the slide notes are available as a separate document, accessible from the lesson home page. The slides that follow are intended for classroom use.

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Unbalanced Forces and Motion: TEKS 8.6A What causes the space shuttle’s acceleration? What produces the unbalanced force needed for liftoff? Does the mass of the space shuttle “system” (shuttle + rockets) change during the first few minutes of flight? Is the acceleration of the space shuttle system constant or does it change?

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Unbalanced Forces and Motion: TEKS 8.6A Time to investigate! Complete the lesson investigation: – Force and Acceleration What unbalanced force is acting on the car? Is this force acting on the car during its entire trip along the ramp? Can you describe the speed of the car during its trip along the ramp?

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Unbalanced Forces and Motion: TEKS 8.6A Newton’s Second Law Newton’s second law helps us understand the connection between force, mass, and motion. Acceleration is a change in the speed or direction of an object. Unbalanced forces produce acceleration.

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Unbalanced Forces and Motion: TEKS 8.6A What happens to acceleration if you change the force? If you double the force pushing on the 1-kilogram cart, how does the acceleration change? If you reduce the force by half, how does the acceleration change? What would happen if you tripled the force? Acceleration is proportional to force.

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Unbalanced Forces and Motion: TEKS 8.6A What happens to acceleration if you change the mass of the object? If you double the mass of an object, and push with the same force, what happens to the acceleration? If you cut the mass of an object in half, and push with the same force, what happens to the acceleration? Acceleration is inversely proportional to mass.

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Unbalanced Forces and Motion: TEKS 8.6A Time for Practice! Complete the lesson practice activity: – Newton’s Second Law Here is a sample problem to work out together as a class: An airplane needs to accelerate at 5 m/s 2 to reach take-off speed before reaching the end of the runway. The mass of the airplane is 5,000 kg. How much force is needed from the engine?

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Unbalanced Forces and Motion: TEKS 8.6A Show what you know! Try the lesson’s interactive quiz, or complete a quiz that your teacher can print out for you. Hint: – You might want to review your lesson reading piece one more time before trying the quiz.

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