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Why Choose an Axe Over a Baseball Bat for Cutting Trees? Understanding Pressure and Force

When cutting down a tree, selecting the right tool can make all the difference. This article explores why an axe, with its focused sharp edge, is more effective than a steel baseball bat. By applying the concept of pressure—defined as force per unit area (P=F/A)—we can understand how an axe delivers greater force onto the tree's surface than a bat. Additionally, we'll discuss free body diagrams to analyze the net forces involved in different scenarios. Discover the science behind effective cutting and the role of physics in tool selection.

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Why Choose an Axe Over a Baseball Bat for Cutting Trees? Understanding Pressure and Force

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Presentation Transcript

  1. Warm Up 7 10.27.11 Why should you choose an axe instead of a steel baseball bat to cut down a tree? (hint: Pressure=Force/Area)

  2. Applying Force - Pressure The amount of force per unit of area is called pressure Pressure = force/area of application P=F/A (A is the area over which the forces act) Unit = Newtons per square meter = pascals (Pa)

  3. Force SI unit – Newton; N A force needed to accelerate a 1 kg mass 1 m/s every second. 1kg*m/s2 = 1N A vector quantity

  4. Free Body Diagrams

  5. Free Body Diagrams, Why?! Calculating requires you to think about what is going on Drawing free body diagrams help you see Net Force

  6. Free Body Diagrams • Is the object accelerating? • If Yes, Net Force ≠ 0 • If No, Net Force = 0 • What is the object on? • If in midair, Fair and Fgrav • If on something, Fnorm and Fgrav

  7. Free Body Diagrams • How many and which way are applied forces going? • Is there Ffric? • If Yes, Ffric is opposite of Fapp

  8. Fnorm Fapp1 Fair + Ffric Fgrav Diagram the forces on the car, traveling at a constant speed.

  9. Fnorm Fapp1 Fair + Ffric What is my Fnet? Fgrav Diagram the forces on the car, accelerating to the left.

  10. Determine the net force for each situation. www.physicsclassroom.com 0 N – balanced force 5 N, Left

  11. Fnorm Fapp1 Fapp2 5 N 5 N Fgrav Create a free body diagram of the dog

  12. Fnorm 5 N 5 N Fapp2 Fapp1 Where’s Ffric? Fgrav Create a free body diagram of the dog

  13. Fnorm Fapp1 Fair + Ffric Fgrav Diagram the forces on the car, traveling at a constant speed.

  14. Determine the net force for each situation. www.physicsclassroom.com 15 N, Up 0 N – object in equilibrium

  15. Warm Up 8 10.28.11 • What were Galileo’s 2 main breakthroughs about motion?

  16. Students who have not taken the Projectile Motion test need to take it by Wednesday afternoon or it will be a zero. • Last day for late work (including catapults) is also Wednesday.

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