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Forces

Forces. Chapter 6 Pages: 116-147. Force. A force is a push or pull upon an object resulting from the object's interaction with another object. Contact Forces Long-Range Forces. Contact Forces.

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Forces

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  1. Forces Chapter 6 Pages: 116-147

  2. Force A force is a push or pull upon an object resulting from the object's interaction with another object. • Contact Forces • Long-Range Forces

  3. Contact Forces Contact forces are types of forces in which the two interacting objects are physically in contact with each other.

  4. Friction

  5. Tension

  6. AirResistance

  7. Long-Range Forces Long-Range Forces are types of forces in which the two interacting objects are not in physical contact with each other, but are able to exert a push or pull despite the physical separation.

  8. Gravity

  9. Magnetism

  10. Electrical

  11. Force

  12. Force • F for use in equations. • Newton is the unit for Force. • N abbreviation for Newton. • Net Force can accelerate. • N = kg m/s2

  13. Force is a Vector Quantity • Magnitude • Direction 4000lb

  14. Read Pages 118-119Answer Question 1 in Notebook

  15. Homework Page: 124 Questions: 7-11

  16. Free Body Diagrams The purpose of a free-body force diagram is to assist you in trying to determine the net force acting on a body.

  17. Net Force The purpose of a free-body force diagram is to assist you in trying to determine the net force acting on a body.

  18. Free Body Diagrams The net force is the vector sum of all the individual forces acting on a system. Fnet = F1± F2± F3 ± F4 …

  19. Constructing “free-body force diagram” • Identify the object(s) you will draw a diagram for. 

  20. Constructing “free-body force diagram” 2. Identify all the forces acting directly on the object and the object exerting them. • Gravity • Table

  21. Constructing “free-body force diagram” 3.Draw a dot to represent the object of interest.

  22. Table Gravity Constructing “free-body force diagram” 4. Draw a vector to represent each force.

  23. Constructing “free-body force diagram” 5. If the object is stationary or is moving at a constant velocity, the vectors should graphically add up to zero. 

  24. Constructing “free-body force diagram” 5.   If the object is accelerating, the sum of the vectors should produce a vector in the same direction as the acceleration.

  25. Floor Gravity Constructing “free-body force diagram” Ffloor=Fgravity Standing on Floor

  26. Muscle Gravity Constructing “free-body force diagram” Fmuscle>Fgravity Jumping

  27. Gravity Constructing “free-body force diagram” Fgravity In the Air

  28. Road Brakes Motor Gravity Types of Motion • No Motion FRoad=FGravity FMotor=FBrakes No Net Force

  29. Road Friction Motor Gravity Types of Motion • Constant Velocity FRoad=FGravity FMotor=FFriction No Net Force

  30. Road Friction Motor Gravity Types of Motion • Speeding Up FRoad=FGravity FMotor>FFriction Net Force

  31. Road Friction Motor Gravity Types of Motion • Slowing Down FRoad=FGravity FMotor<FFriction Net Force

  32. FM=400N FR=4000N FF=400N FG=4000N Finding Net Force VerticalFnet = FR - FG HorizontalFnet = FF - FM Fnet=4000N–4000N Fnet=400N–400N Fnet= 0N Fnet= 0N

  33. FR=4000N FF=400N FG=4000N Finding Net Force FM=400N Not Moving OrConstant Velocity

  34. FM=400N FR=4000N FF=100N FG=4000N Finding Net Force VerticalFnet = FR - FG HorizontalFnet = FF - FM Fnet=4000N–4000N Fnet=100N–400N Fnet= 0N Fnet= -300N

  35. FR=4000N FF=100N FG=4000N Finding Net Force FM=400N Acceleratingto the Left.

  36. Newton’s Second Law of Motion Law of Acceleration

  37. Newton’s Second Law of Motion The acceleration of an object as produced by a net force is directly proportional to the magnitude of the net force, in the same direction as the net force, and inversely proportional to the mass of the object.

  38. FNet = 1N Accelerates Ff = 40N FP = 41N Newton’s Second Law of Motion

  39. a F Newton’s Second Law of Motion m FNet = ma

  40. Newton’s First Law of Motion Law of Inertia

  41. Inertia Inertia is the resistance an object has to a change in its state of motion. Mass

  42. Newton’s First Law of Motion

  43. Seat Belt!!!!

  44. Newton’s First Law of Motion An object at rest tends to stay at rest and an object in motion tends to stay in motion with the same speed and in the same direction unless acted upon by an unbalanced force.

  45. Mass vs. Weight Mass is the amount of stuff you are made up of. (kg or slugs) Does not change!!!!

  46. Mass vs. Weight Weight depends on how much gravity is acting on you at the moment; you'd weigh less on the moon than on Earth. (newtons or pounds)

  47. Mass vs. Weight Weight

  48. Mass vs. Weight Mass

  49. Weight To calculate weight use the acceleration due to gravity (9.8m/s2). This will be called g. F=ma Fg=mg

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