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Chapter 9 Motion

Chapter 9 Motion






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    Chapter 9 Motion Chapter 9 Motion Presentation Transcript

    • Chapter 9 Motion and Energy
    • Section 1
      • Motion -Something is in motion if its distance from another object is changing.
      • Reference Point- a place or object used for comparison to determine if something is in motion.
      • Distance- the length of a path between two points
      • Displacement- the length and direction that an object has moved from its starting point.
      • Vector- a quantity that consists of both a magnitude and a direction.
    • Section 2
      • Speed- the distance the object travels per unit of time.
      • Average speed= distance/ time
      • Instantaneous speed- the rate at which an object is moving at a given instance in time.
      • Velocity- speed in a given direction .
    • Distance vs. Time
      • Upward slope= moving away from starting position.
      • Downward slope= moving toward starting position.
      • Horizontal line= not moving.
    • Section 3
      • Acceleration - the rate at which velocity changes with time.
      • Increasing speed
      • Decreasing speed
      • Changing direction
      • = Final velocity - original velocity
      • Time
    • Velocity vs. Time
      • Slope- the steepness of a line on a graph.
      • A steep incline is an increase in speed.
      • A steep decline is a decrease in speed.
      • A horizontal line is maintaining a constant speed.
    • Section 4
      • Work- when an object is caused to move a certain distance.
      • Energy- the ability to do work or cause change.
      • Kinetic energy- the energy an object has due to its motion.
      • KE= 1/2 x mass x speed 2
      • Measured in Joules (J)
      • Potential energy- stored energy that results from the position or shape of an object.
      • Gravitational potential energy- depends on its weight and on its height relative to a reference point.
      • GPE= weight x height
      • Elastic potential energy- the potential energy of objects that can be stretched or compressed.
      • Mechanical energy- an object’s combined kinetic energy and potential energy.
      • ME = KE + PE
      • Law of Conservation of Energy- energy cannot be created or destroyed but transformed from one form to another.