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Let’s Play Jeopardy

Let’s Play Jeopardy. Force and Motion. 100. 100. 100. 100. 200. 200. 200. 200. 300. 300. 300. 300. 400. 400. 400. 400. 500. 500. 500. 500. Force 100. Describe the two types of forces and give an example. See Answer. Force 100 A. Field Force -gravity -electrical

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Let’s Play Jeopardy

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  1. Let’sPlayJeopardy

  2. Force and Motion 100 100 100 100 200 200 200 200 300 300 300 300 400 400 400 400 500 500 500 500

  3. Force100 Describe the two types of forces and give an example. See Answer

  4. Force100 A Field Force -gravity -electrical -magnetic Contact Force -push -pull Contact Forces Frictional Force = Ffrict Tensional Force = Ftens Normal Force = Fnorm Air Resistance Force = Fair Applied Force = Fapp Spring Force= Fspring

  5. Force200 The fundamental units of Force Answer

  6. Force200 A N = kg x m/s2

  7. Force 300 Analyze the following scenario and give the forces involved: A car being pulled by a towing cable. Answer

  8. Force 300A -Gravity -Normal -Friction -Applied (pull)

  9. Force 400 Solve for the components of the net force on a 5 kg balloon moving upward at 2.0 m/s2 at 25o. Answer

  10. Forces 400A Answer Fx = ma(cosθ) = 9.1N Fy = ma(sinθ) = 4.2 N

  11. Force 500 Find the net force of the following diagram. Answer

  12. Force500A 20.6 N at 14.00 South of East

  13. Newton 100 Explain the cause of acceleration. Provide the law that explains this principle. Answer

  14. Newton100A Force Newton’s Second Law F=ma.

  15. Newton200 The term Newton uses in his first law to explain an objects tendency to maintain its state of motion. Answer

  16. Newton200A Inertia An object at rest stays in rest, an object in motion stays in motion, unless acted on by an unbalanced force.

  17. Newton300 A hammer drives a nail into a piece of wood. Identify the action-reaction pair in this situation. Which of Newton’s laws explains this situation? Answer

  18. Newton300 A The hammer exerts a force on the nail: the wood exerts a force on the wood. Newton’s 3rd Law

  19. Newton400 As a basketball player starts to jump for a rebound, the player begins to move upward faster and faster until his shoes leave the floor. Describe the force of the floor on the shoes in relation to Fg at the moment the player begins to jump. Answer

  20. Newton400A Is greater than the player’s weight

  21. Newton500 A 1856 kg truck is moving to the right at a constant speed of 2.17 m/s2 . What is the net force on the car? What would it be if it were to move in the opposite direction. Answer

  22. Newton500 A Zero, at constant velocity the acceleration is zero. Therefore, the net force is zero regardless of the direction.

  23. Free Body Diagrams100 Describe three things that are represented in a free-body diagram. Answer

  24. Free Body Diagrams 100A -the object -forces as vectors (magnitude and direction) -forces exerted on the object

  25. Free Body Diagrams 200 Create a diagram of a book is at rest on a table top. Answer

  26. Free Body Diagrams 200A In this diagram, there are normal and gravitational forces on the book.

  27. Free Body Diagrams 300 A flying squirrel is gliding (no wing flaps) from a tree to the ground at constant velocity. Consider air resistance. A free body diagram for this situation looks like… Answer

  28. Free Body Diagrams 300A Gravity pulls down on the squirrel while air resistance keeps the squirrel in the air for a while.

  29. Free Body Diagrams 400 Create a diagram for a car that runs out of gas and is coasting down a hill. Answer

  30. Free Body Diagrams 400A Even though the car is coasting down the hill, there is still the dragging friction of the road (left pointing arrow) as well as gravity and normal forces.

  31. Free Body Diagrams 500 A box is pulled across a surface at an angle, the box only moves in the x direction. Write the equations for the sum of the forces in the x and y directions in terms of the variables in the picture. Answer

  32. Free Body Diagrams 500A • Fx =Ftcosθ-Ff = ma • Fy = Fn+Ftsinθ-Fg = 0 (no movement)

  33. Friction 100 Compare Kinetic and Static friction. Answer

  34. Friction 100A • Kinetic friction is the frictional force of an object in motion. Static friction is the frictional force that keeps an object from moving, the minimum amount of force that must be applied for an object to have motion.

  35. Friction200 What is the unit of the coefficient of friction? Answer

  36. Friction 200A μ does not have a unit because it is a ratio of the Force of friction and the normal force. Therefore, the units cancel out.

  37. Friction 300 What happens to air resistance when an object accelerates? Why is it considered a form of friction? Answer

  38. Friction 300 A In most cases, air resistance increases with increasing speed. Therefore, friction is a retarding force so it can be classified as friction because it is opposing or slowing down the motion.

  39. Friction 400 There are six books in a stack, each book weighs 5N. The coefficient of static friction between the books is 0.2. Determine what the horizontal force must be to begin sliding the top five books off the bottom one. Answer

  40. Friction 400A Fx = Fapp-Fs = 0 Fapp=Fs=μFn Fn = Fg Fg = 5 x 5N = 25N Fapp = (0.2) 25N = 5 N

  41. Friction500 An ice skater moving at 10.0 m/s coasts to a halt in 1.0 x 102 m on a smooth ice surface. What is the coefficient of friction between the ice and the skates? Answer

  42. Friction 500A (1) Fx = Ff = ma (2) Fy = 0, Fn = Fg (3) Ff = μFn = μFg Fg = mg Ff = μmg = ma Eq (1) and (3) combined μmg = ma m cancels out μg = a….so… μ = a/g Solve for a….a = -(vi)2/2∆x = - 0.50 m/s2 μ = a/g = 0.50/9.81 = 0.051

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