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Forces and Free Body Diagrams

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  1. All members of your group must have the same answer on your whiteboard to earn points for a question. Let’s Play!

  2. Forces and Free Body Diagrams

  3. Mass and Weight

  4. Friction and Springs

  5. Equilibrium and Vectors

  6. Inertia

  7. Newton’s 2nd and 3rd Laws

  8. Friction & Springs Forces & FBD’s Mass & Weight Equilibrium & Vectors Inertia Newton’s 2nd and 3rd Laws • 100 • 100 • 100 • 100 • 100 • 100 200 200 200 200 200 200 300 300 300 300 300 300 400 400 400 400 400 400 500 500 500 500 500 500

  9. This is the FBD of an apple falling from a tree.

  10. Fg

  11. This is a support force which points perpendicular to surfaces.

  12. What is the normal force?

  13. This is the FBD of a box sliding down a ramp.

  14. Ff Fn Fg

  15. This is the FBD of a hockey puck sliding across the ice (frictionless, no air resistance).

  16. Fn Fg

  17. This is the FBD of a fish in a bear’s mouth.

  18. Fp Fp Fg

  19. This quantity will not change if you go to the moon.

  20. What is your mass?

  21. This is the weight of a 10-kg object on Earth.

  22. What is about 100 N?

  23. This is the mass of an object that has a weight of 981 N on Earth.

  24. What is 100 kg?

  25. A 2kg object has this weight on the Moon. (g = 1.6 m/s2)

  26. What is 3.2N?

  27. An object is 30N on Earth. What is its weight on Jupiter? (g = 26 m/s2)

  28. What is 78N?

  29. µ “mu” means this physically.

  30. What is the “roughness” or the “bumpiness” of a surface?

  31. The spring constant “k” physically describes this.

  32. What is the “stretchiness” or “stiffness” of the spring?

  33. This line represents the coefficient of static friction. B Friction Force (N) A Normal Force (N)

  34. What is line B? (because static friction is ALWAYS greater than kinetic)

  35. A spring has an equilibrium length of 5 cm, and is stretched to 7.5 cm. This is the displacement (∆x).

  36. What is 2.5 cm?

  37. A spring has a constant of 100 N/m. If a 5kg mass is hung on it, then it will stretch this far from equilibrium.

  38. What is 0.5m?

  39. (T/F) An object in equilibrium experiences no forces.

  40. What is False.

  41. This is the meaning of static equilibrium.

  42. What is stationary and balanced?

  43. Daily Double!

  44. We are OPEN If the sign has a mass of 50 kg, this is the tension is each cable.

  45. What is 250N?

  46. A vector has these two things.

  47. What is a magnitude and a direction?

  48. The resultant vector has this magnitude and direction. 30N 40N