MOTION

MOTION

1. Reference Point

   • A place or object, used for comparison to determine if something is in motion

2. Motion is a change in position of an object with respect to time also on its reference point. Motion is typically described in terms of displacement, distance (scalar), velocity, acceleration, time and speed.

3. International System of Units

   • The International System of Units is the modern form of the metric system and is the world's most widely used system of measurement. Example: meter, centimeter, milimeter, decimeter
   • It is used to describe the distance an object moves. It is also used to describe quantities other than length.

4. Speed

   • Equation: Distance/Time
   • It is the distance the object travels per unit of time.
   • Average speed: The average speed of an object in an interval of time is the distance travelled by the object divided by the duration of the interval
     • Calculate: Divide total distance travelled by the total time
   • Instantaneous Speed: instantaneous speed is the limit of the average speed as the duration of the time interval approaches zero.

5. Velocity

   • If both speed and direction of an object in motion is given, then you know the velocity. It can also be said as speed with direction

6. Acceleration

   • Acceleration refers to increasing speed, or changing direction
   • Increasing speed: If the objects speed increases, it accelerates
   • Decreasing speed: The slowing down of an object, deceleration, is also acceleration
   • Changing direction: If the object travels at a constant speed, it is still accelerating. Objects can change their directions
   • Acceleration= Final Velocity-Initial Velocity/Time

7. Slope

   • Formula: Rise/Run
   • Steepness of a line on a graph is slope

8. Graphs

   • Line graph: The motion of an object can be shown in this graph where you plot distance vs time
   • Speed-Versus-Time-Graph: The acceleration can be determined from the slope/gradient of the graph. The steeper the gradient the higher the average speed. A horizontal line indicates the object is moving at constant velocity.
   • Distance-Versus-Time-Graph: The motion of an accelerating object can be represented on it. It is usually a curve line and if the curve goes up it is positive, whereas if it goes down it is negative

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