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FORCE

FORCE. Chapter 10 Text. Force. A push or a pull in a certain direction SI Unit = Newton (N). Combining Forces. The combination of all forces acting on an object is the Net Force. When forces act in the SAME DIRECTION = ADDITION. When forces act in the OPPOSITE DIRECTION = SUBTRACTION.

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FORCE

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  1. FORCE Chapter 10 Text

  2. Force • A push or a pull in a certain direction • SI Unit = Newton (N)

  3. Combining Forces • The combination of all forces acting on an object is the Net Force.

  4. When forces act in the SAME DIRECTION = ADDITION

  5. When forces act in the OPPOSITE DIRECTION = SUBTRACTION

  6. Balanced Forces result in NO MOVEMENT

  7. = 0

  8. Unbalanced forces • cause a change in the object’s motion.

  9. =

  10. =

  11. Friction and Gravity • Friction – the force that two surfaces exert on each other when they rub

  12. Types of Friction • 1. Static Friction • 2. Sliding Friction • 3. Rolling Friction • 4. Fluid Friction

  13. Static Friction • Friction that acts on objects that are NOT moving

  14. Sliding Friction • Occurs when two surfaces slide over each other

  15. Rolling Friction • Occurs when an object rolls across a surface

  16. Fluid Friction • Occurs when solid objects moves through fluids such as water, oil, or air

  17. Friction depends on two factors: • 1. How hard the surfaces push together

  18. 2. The type of surfaces involved

  19. Gravity • A force that pulls objects toward each other

  20. 2 Factors Affecting Gravity • 1. Distance • 2. Mass

  21. If Distance Increases the force of gravity Decreases

  22. Mass • The amount of matter in an object

  23. If mass increases, the force of gravity increases

  24. Mass vs. Weight Mass is Constant because of the amount of matter does not change

  25. The force of gravity on a person or object at the surface of a planet is known as weight.

  26. Weight varies with the strength of the gravitational force, mass does not.

  27. Gravity and Motion • Free fall – when the only force acting on a falling object is gravity

  28. Acceleration due to gravity is • 9.8 m/s/s

  29. All objects in free fall accelerate at the SAME rate regardless of their masses

  30. Why don’t objects fall at the same rate?

  31. Air Resistance • Falling objects with a greater surface area experience more air resistance.

  32. Terminal Velocity • Reached when the force of air resistance equals the weight of the object

  33. Newton’s Laws of Motion

  34. Newton’s 1st Law • an object at rest will remain at rest, an object in motion will stay in motion UNLESS acted upon by another force.

  35. Inertia • Resistance to a change in motion • Newton’s 1st Law

  36. Inertia depends on mass, the greater the mass the greater the inertia

  37. Newton’s 2nd Law • Force = mass x acc.

  38. Acceleration =Net Force Mass

  39. End Unit for Acceleration • kg•m/s/s • Kg•m/s2 • Newton

  40. Textbook samples

  41. Calculating: Calculate the slope of the graph. What does the slope tell you about the object’s motion?

  42. The slope is 9.8. The speed increases by 9.8 m/s each second.

  43. What will the speed of the object be at 6 seconds? 58.8 m/s

  44. A speedboat pulls a 55-kg water-skier. The force causes the skier to accelerate at 2.0 m/s2. Calculate the force that causes this acceleration.

  45. Fnet = mXa= 55 kg X 2.0 m/s2 • F = 110 kg • m/s2 • F = 110 N

  46. What is the net force on a 1,000-kg object accelerating at 3 m/s2?

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