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Jeopardy

Jeopardy. PHY101 Chapter Two Review Newton’s Laws. Study of Newton’s Laws. Basics of Force $100. What is Force?. ANSWER. Basics of Force $200. What is the equation for force? What are the units in the 3 systems?. ANSWER. Basics of Force $300. What is weight?. ANSWER.

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Jeopardy

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  1. Jeopardy PHY101 Chapter Two Review Newton’s Laws

  2. Study of Newton’s Laws

  3. Basics of Force$100 What is Force? ANSWER

  4. Basics of Force$200 What is the equation for force? What are the units in the 3 systems? ANSWER

  5. Basics of Force$300 What is weight? ANSWER

  6. Basics of Force$400 What is momentum? ANSWER

  7. Newton's Laws $100 What is mass? ANSWER

  8. Newton's Laws $200 What is Newton’s First Law? ANSWER

  9. Newton's Laws $300 What is Newton’s 2nd Law? ANSWER

  10. Newton's Laws $400 What is Newton’s 3rd Law? ANSWER

  11. Analyzing Forces $100 What is a free body diagram? ANSWER

  12. Analyzing Forces $200 What is a normal force? ANSWER

  13. Analyzing Forces $300 What is Hooke’s Law? ANSWER

  14. Analyzing Forces $400 A child stands on a bathroom scale while riding in an elevator. The child's weight when the elevator is not moving is 200 N. What is the child’s mass in kg? What does the scale read (tension T) when the elevator accelerates upward at 1.00 m/s2? ANSWER

  15. Circular Motion $100 If an object moves in a circle, what kind of force acts the centripetal force? ANSWER

  16. Circular Motion $200 What is the equation for centripetal (radial) force? ANSWER

  17. Circular Motion $300 What is Newton’s Law of Gravity? ANSWER

  18. Circular Motion $400 What is the acceleration due to the earth's gravity at a distance of one earth radius above the earth's surface? a. 2.5 m/s² b. 5 m/s² c. 10 m/s² d. 20 m/s² ANSWER

  19. Resistive Forces $100 What is a drag force? ANSWER

  20. Resistive Forces $200 What is friction? ANSWER

  21. Resistive Forces $300 Name two types of friction? ANSWER

  22. Resistive Forces $400 A horizontal force of 640 N is applied to a car with a mass of 1600 kg. What is the acceleration of the car if the coefficient of rolling friction is 0.01? a. 0.02 m/s² b. 0.03 m/s² c. 0.2 m/s² d. 0.3 m/s² ANSWER

  23. Potpourri $100 A 9.00-kg object is moving in a circle with a constant speed of 45.0 m/s. If the circular path has a radius of 20.0 m, what is the net force on the object? ANSWER

  24. Potpourri $200 What are the conditions for simple harmonic motion? ANSWER

  25. Potpourri $300 Before going to the beach, you check the position of the moon. Why? ANSWER

  26. Potpourri $400 The average orbital speed of Mars is 2.41 x 104 m/s. If the radius of Mars's orbit is 2.28 x 1011 m, how long does it take Mars to complete one orbit? ANSWER

  27. Basics of Force$100Answer What is Force? Force is a push or a pull. Back to Jeopardy

  28. Basics of Force$200Answer What is the equation for force? Force = F = ma = mDv/Dt SI unit 1 kg*m/s² = 1 Newton = 1 N cgs unit 1 g*cm/s² = 1 dyne Common unit 1 slug*ft/s² = 1 lb. 1 N = 105 dynes = 0.2248 lbs Back to Jeopardy

  29. Basics of Force$300Answer What is weight? Weight is the force of gravity acting on a body. W = mg where g is local gravity Back to Jeopardy

  30. Basics of Force$400Answer • What is momentum? • Momentum is mass X velocity • p = mv Unit is 1 kg*m/s in SI Back to Jeopardy

  31. Newton's Laws $100Answer What is mass? Mass is a measure of an object’s resistance to acceleration. It is a measure of the quantity of matter in an object. Back to Jeopardy

  32. Newton's Laws $200Answer What is Newton’s First Law? An object will remain at rest or in motion with a constant velocity unless acted upon by an outside force.  F = 0 v = constant a = 0 Back to Jeopardy

  33. Newton's Laws $300Answer What is Newton’s 2nd Law? An object is accelerated whenever a net external force acts on it. The net force equals the objects mass times its acceleration.  F = ma Back to Jeopardy

  34. Newton's Laws $400Answer What is Newton’s 3rd Law? Forces always come in pairs. When one object exerts a force on a second object, the second exerts an equal and opposite force on the first.  F = 0 F12 = -F21 Back to Jeopardy

  35. Analyzing Forces $100Answer What is a free body diagram? A free body diagram is a force picture showing all the forces, the net acceleration and the direction of motion.  Fy= ma = T - mg T a T = mg + ma T = m(g + a) mg Back to Jeopardy

  36. Analyzing Forces $200Answer What is a normal force? A normal force is a (reactive) balancing force such that  F = 0. Back to Jeopardy

  37. Analyzing Forces $300Answer • What is Hooke’s Law? • This is a conservative spring force equation. • F= - kSx = ma where kS = Weight of spring & object/stretch in SI units of N/m Back to Jeopardy

  38. Analyzing Forces $400Answer A child stands on a bathroom scale while riding in an elevator. The child's weight when the elevator is not moving is 200 N. What is the child’s mass in kg? m = Weight/g = 20.4 kg What does the scale read (tension T) when the elevator accelerates upward at 1.00 m/s2?  Fy= ma = T - mg T = mg + ma T = m(g + a) = 220 N Back to Jeopardy

  39. Circular Motion $100Answer If an object moves in a circle, what kind of force acts the centripetal force? A real force like tension or gravity must act as a centripetal force and point toward the center of the circle. Back to Jeopardy

  40. Circular Motion $200Answer What is the equation for centripetal (radial) force? SF centripetal = mv²/r Back to Jeopardy

  41. Circular Motion $300Answer What is Newton’s Law of Gravity? F = G m1*m2/d² G = 6.67 * 10-11 N*m²/kg² Back to Jeopardy

  42. Circular Motion $400Answer • What is the acceleration due to the earth's gravity at a distance of one earth radius above the earth's surface? • 2.5 m/s² b. 5 m/s² c. 10 m/s² d. 20 m/s² • F = G M*m/d² = mg • If dnew = 2d, then FNEW = G M*m/(4d²) = mgNEW = mg/4 • gNEW = g/4 = 2.45 m/s² Back to Jeopardy

  43. Resistive Forces $100Answer What is a drag force? A resistive force called air resistance. Drag Force = ½ C*density*Area*v² Back to Jeopardy

  44. Resistive Forces $200Answer What is friction? A force of resistance to relative motion between 2 bodies or substances in physical contact. f = Coefficient of friction *Normal Force = µFN Back to Jeopardy

  45. Resistive Forces $300Answer Name two types of friction? Static friction no motion Kinetic friction motion Back to Jeopardy

  46. Resistive Forces $400Answer A horizontal force of 640 N is applied to a car with a mass of 1600 kg. What is the acceleration of the car if the coefficient of rolling friction is 0.01? a. 0.02 m/s² b. 0.03 m/s² c. 0.2 m/s² d. 0.3 m/s² SFy = 0 = FN – mg FN = mg = 15680 N fK = µFN = µmg = 157 N SFX = ma = Pull – fk = 640 N – 157 N = 483 N a = SFX /m = 483 N/ 1600 kg = 0.30 m/s² Back to Jeopardy

  47. Potpourri $100Answer A 9.00-kg object is moving in a circle with a constant speed of 45.0 m/s. If the circular path has a radius of 20.0 m, what is the net force on the object? F = mv²/r = (9.00kg)*(45 m/s)²/(20.0m) = 911 N Back to Jeopardy

  48. Potpourri $200Answer • What are the conditions for simple harmonic motion? • Motion must be periodic • Force must cause the motion and be parallel to it. Back to Jeopardy

  49. Potpourri $300Answer Before going to the beach, you check the position of the moon. Why? Low tide = moon on horizon High tide = high point in sky Back to Jeopardy

  50. Potpourri $400Answer The average orbital speed of Mars is 2.41 x 104 m/s. If the radius of Mars's orbit is 2.28 x 1011 m, how long does it take Mars to complete one orbit? V = 2pr/T T = 2pr/v = 5.94 * 107 sec = 688 days Back to Jeopardy

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