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Newton’s Laws

Newton’s Laws. Force Vectors. Newton’s First Law. Newton’s Second Law. Newton’s Third Law. Physics is Phun!. Force Vectors. Newton’s First Law. Newton’s Second Law. Newton’s Third Law. Physics is Phun!. 5 pt. 5 pt. 5 pt. 5 pt. 5 pt. 10 pt. 10 pt. 10 pt. 10 pt. 10 pt. 15 pt.

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Newton’s Laws

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  1. Newton’s Laws

  2. Force Vectors

  3. Newton’s First Law

  4. Newton’s Second Law

  5. Newton’s Third Law

  6. Physics is Phun!

  7. Force Vectors Newton’s First Law Newton’s Second Law Newton’s Third Law Physics is Phun! 5 pt. 5 pt. 5 pt. 5 pt. 5 pt. 10 pt. 10 pt. 10 pt. 10 pt. 10 pt. 15 pt. 15 pt. 15 pt. 15 pt. 15 pt. 20 pt. 20 pt. 20 pt. 20 pt. 20 pt. 25 pt. 25 pt. 25 pt. 25 pt. 25 pt.

  8. 1-5 A physics textbook is sitting on the table in front of you. Are there any forces acting on it? 5 pt.

  9. 1-5A A physics textbook is sitting on the table in front of you. Are there any forces acting on it? Yes, the book’s weight pulling down and the table pushing up. 5 pt.

  10. 1-10 Which string pulls harder on the hanging mass? 1 2 10 pt.

  11. 1-10A Which string pulls harder on the hanging mass? 1 2 String #1 10 pt.

  12. 1-15 Draw a free-body diagram of the forces acting on the object below. It is a stone sliding (with friction) down a ramp. Label all forces! 15 pt.

  13. 1-15A Draw a free-body diagram of the forces acting on the object below. It is a stone sliding (with friction) down a ramp. Label all forces! Ff FN Fg 15 pt.

  14. 1-20 If the ball on the string below is accelerated upwards at 20 m/s2, draw the string and weight forces to scale… 20 pt.

  15. 1-20A If the ball on the string below is accelerated upwards at 20 m/s2, draw the string and weight forces to scale… Tstring Fg 20 pt.

  16. 1-25 Your Team may wager from 0-50 pts. Type question here. Adjust size & position as necessary. You must make your wager BEFORE the Daily Double in revealed!!! 25 pt.

  17. 1-25A Daily Double Daily Double Two hockey players are pushing on a puck as it travels across the ice. Their force vectors are shown below. What is the resultant force experienced by the puck? 100 N Fnet Fnet = sqrt(1002 + 1302) Fnet = 164 N 130 N Daily Double

  18. 2-5 1 3 2 Along which path will the ball move once it hits the gap? 5 pt.

  19. 2-5A 1 3 2 Along which path will the ball move once it hits the gap? Path #2 5 pt.

  20. 2-10 True or False: It is possible for an object to be moving and still be in equilibrium. 10 pt.

  21. 2-10A True or False: It is possible for an object to be moving and still be in equilibrium. True – So long as there is no acceleration or change in motion, the object is in equilibrium. 10 pt.

  22. 2-15 A car on a race track travels around the circular track at a constant speed. Is it in equilibrium? 15 pt.

  23. 2-15A A car on a race track travels around the circular track at a constant speed. Is it in equilibrium? No – because in order for the car to move in a circle, there has to be a net force causing a change in the car’s direction. 15 pt.

  24. 2-20 You and a friend push a heavy crate across the floor at a constant speed. If you push with a combined force of 100 N, how hard is friction pushing back on the crate? A) less than 100 N B) 100 N exactly C) more than 100 N D) not enough info 20 pt.

  25. 2-20A You and a friend push a heavy crate across the floor at a constant speed. If you push with a combined force of 100 N, how hard is friction pushing back on the crate? A) less than 100 N B) 100 N exactly C) more than 100 N D) not enough info 20 pt.

  26. 2-25 Suppose you are in an elevator as it accelerates upwards. At that moment, you would feel ________. Why is this? 25 pt.

  27. 2-25A Suppose you are in an elevator as it accelerates upwards. At that moment, you would feel ________. Why is this? Heavier than normal – This is because as the elevator accelerates upwards, you (due to your inertia) lag behind, so you feel pressed against the floor harder. Thus, you feel a fictitious force that makes you feel heavier than normal. 25 pt.

  28. 3-5 Two objects (one 10-kg and one 20-kg) are pressed on by the same force. Which one will accelerate more, and by how much? 5 pt.

  29. 3-5A Two objects (one 10-kg and one 20-kg) are pressed on by the same force. Which one will accelerate more, and by how much? The 10-kg object will accelerate by 2x more. 5 pt.

  30. 3-10 What is the weight of a 50-kg object as it falls at a speed of 100 m/sec in a vacuum? 10 pt.

  31. 3-10A What is the weight of a 50-kg object as it falls at a speed of 100 m/sec in a vacuum? The speed of the object has no effect on its weight, so… W = mg = (50 kg)(9.8 m/sec2) W = 490 Newtons 10 pt.

  32. 3-15 A 2000 kg rocket accelerates through the atmosphere pushed by a thrust of 20,000 N. If the air drag is 18,000 N, then what is the net force acting on it? 15 pt.

  33. 3-15A A 2000 kg rocket accelerates up through the atmosphere pushed by a thrust of 40,000 N. If the air drag is 18,000 N, then what is the net force acting on it? Fnet = Up – Down Fnet = 20,000 N – 18,000 N = 2,000 N 15 pt.

  34. 3-20 A 2000-kg car accelerates down the road. The engine drives it with a force of 5000 N, and friction from the road is 1400 N. What is the car’s acceleration? 20 pt.

  35. 3-20A A 2000-kg car accelerates down the road. The engine drives it with a force of 5000 N, and friction from the road is 1400 N. What is the car’s acceleration? Fnet = ma and Fnet = 5000 N – 1400 N So… Fnet = 3600 N = (2000 kg)a a = 3600 N/2000 kg = 1.8 m/sec2 20 pt.

  36. 3-25 A 75-kg parachutist is falling through the air – while experiencing an air drag of 200 N. If they fall from rest for 10 seconds in this manner, how fast are they moving? 25 pt.

  37. 3-25A A 75-kg parachutist is falling through the air – while experiencing an air drag of 200 N. If they fall from rest for 10 seconds in this manner, how fast are they moving? v = a t so we must find a… Fnet = Weight – Drag = ma So… (75 kg)(9.8 m/s2) – 200 N = (75 kg)a 535 N/75 kg = 7.13 m/s2= a v = (7.13 m/s2)(10 sec) = 71.3 m/sec 25 pt.

  38. 4-5 When you push against a wall that does not move, the force exerted on you by the wall is ______ as compared to the force you exert back on it. • greater than • the same • less than • not enough info 5 pt.

  39. 4-5A When you bounce off of a trampoline, the force exerted on you by the trampoline is ______ as compared to the force you exert back on it. • greater than • the same • less than • not enough info 5 pt.

  40. 4-10 What is the reaction force that propels a rocket such as the Space Shuttle? A) the rocket pushing against the launch pad B) the force from the atmosphere C) gravity’s pull from the Earth D) the exhaust gas pushing on the rocket E) not enough info 10 pt.

  41. 4-10A What is the reaction force that propels a rocket such as the Space Shuttle? A) the rocket pushing against the launch pad B) the force from the atmosphere C) gravity’s pull from the Earth D) the exhaust gas pushing on the rocket E) not enough info 10 pt.

  42. 4-15 A Honda Civic and an 18-wheeler moving at the same speed collide head-on. Which one experiences a greater force of impact? 15 pt.

  43. 4-15A A Honda Civic and an 18-wheeler moving at the same speed collide head-on. Which one experiences a greater force of impact? They both experience the same force, though the Civic, since it has less mass, will undergo a greater acceleration. 15 pt.

  44. 4-20 Two students, Small Sid and Big Barney, are playing tug-of-war with a rope. Which of them pulls harder on the rope?

  45. 4-20A Two students, Small Sid and Big Barney, are playing tug-of-war with a rope. Which of them pulls harder on the rope? Neither pulls harder – they exert equal and opposing forces on the rope. 20 pt.

  46. 4-25 A 1-N apple sits on the surface of the Earth. What is the Earth’s weight in reference to this apple? (Note that I’m not asking for the Earth’s mass!) 25 pt.

  47. 4-25A A 1-N apple sits on the surface of the Earth. What is the Earth’s weight in reference to this apple? (Note that I’m not asking for the Earth’s mass!) 1 Newton The Earth’s weight depends on the object you’re measuring it against. So since the Earth pulls on the apple with a force of 1-N, the apple pulls back on the Earth gravitationally with a force of 1-N. 25 pt.

  48. 5-5 What’s the punch line? “A neutron walks into a bar; he asks the bartender, 'How much for a beer?' The bartender looks at him, and says…” 5 pt.

  49. 5-5A What’s the punch line? “A neutron walks into a bar; he asks the bartender, 'How much for a beer?' The bartender looks at him, and says…” 'For you, no charge.' 5 pt.

  50. 5-10 Name the character and movie that produced this famous quote: “Bye-bye boys, have fun storming the castle!” 10 pt.

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