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  • 1. Chapter 10 Forces
  • 2. Section 1
    • Force- a push or a pull. Described by its magnitude and direction.
    • Newton- (N) the SI unit for the magnitude of a force. Also called weight.
  • 3. • Net Force- The combination of all forces. Determines whether an object moves and in which direction. • Unbalanced Forces- can cause the velocity of an object to change. • Balanced Forces- equal forces acting on one object in opposite directions. Balanced forces acting on an object do not change the object’s velocity.
  • 4. Section 2
    • Friction- a force that acts in a direction opposite to the motion of objects. The strength of friction depends on the type of surface. Without friction, a moving object would not stop without hitting another object.
  • 5.
    • Static Friction- friction that acts on objects that are not moving. Ex.
    • Sliding Friction- occurs when two solid objects slide over each other. Ex.
    • Rolling Friction- when an object rolls across a surface. Ex.
    • Fluid Friction- when a solid object moves through a fluid. Ex.
  • 6.
    • Gravity- a force that pulls objects toward each other.
    • Mass- the amount of matter in an object.
    • Weight- the gravitational force exerted on a person or object at the surface of a planet.
    • Weight= Mass x acceleration due to gravity
    • Acceleration due to gravity= 9.8 m/s 2
  • 7.
    • Free Fall- when the only force acting on an object is gravity.
    • Air Resistance- a type of fluid fiction.
    • Projectile- an object hat is thrown.
    • Elastic forces-
      • Compression: a force that squeezes or pushes matter together.
      • Tension: a force that stretches or pulls matter.
  • 8. Section 3
    • Newton’s 1st law of motion- an object will remain at rest or moving unless it is acted upon by an unbalanced force.
    • Inertia- resistance to a change in motion.
  • 9. • Newton’s Second Law of Motion- acceleration depends on the the net force of the object and its mass. Acceleration = Net force Mass OR Net force= Mass x acceleration
  • 10. Section 4
    • Newton’s Third Law of Motion- for every action there is an equal and opposite reaction.
    • Momentum- a moving object has both mass and velocity.
    • Momentum=mass x velocity
    • Law of conservation of momentum- momentum is transferred from one object to another.