Motion

Motion

1. Motion

   • Motion is the action or process of moving or being moved and an object is in motion if its distance from another object is changing.
   • How to tell if an object is in motion
     • To know an object is in motion you use a reference point. A reference point is a place or object used for comparison to tell whether another object or thing is moving.
     • Reference point
       • A reference point is a place or object used for comparison to tell whether another object or thing is moving.
   • Graphing Motion
     • To show the motion of an object you have to plot it on a line graph which is distance versus time.

2. Describing motion

   • Motion is described by distance which is measured in Units.
   • Measuring distance
     • Distance is mostly measured using the International System of Units.
   • International System of Units
     • The International System of Units is a system of measurement that most scientists around the world use to describe the distance an object moves. The basic unit of length for this system is meters.
     • Examples
       • There are many units to the International System of Units. The main ones are Millimeters, Centimeters, Meters, Kilometers etc. There are many more.

3. Speed

   • Speed is the distance an object or thing travels per unit of time.
   • Average Speed
     • Not every object that is in motion has a constant speed but it does have an average speed. To calculate the average speed divide the total distance traveled by the total time.
   • Instantaneous Speed
     • Instantaneous speed is the rate an object is moving at a given instant in time.
   • Velocity
     • Velocity is basically speed in a given direction. When you know both speed and direction of an objects motion you know its velocity.
     • Acceleration
       • In science acceleration is the rate in which velocity changes. Therefore acceleration refers to increasing speed, decreasing speed, or changing direction.
       • Calculating Acceleration
         • To calculate the acceleration of an object moving in a straight line you have to calculate the change in speed per unit of time.
       • Acceleration Equation
         • The acceleration equation is Acceleration=Final Speed-Initial Speed/Time.
   • Speed Equation
     • The speed equation is distance over time.
   • Slope
     • The steepness of a line on a graph is called slope. Slopes on graphs are used to show the speed of an object using distance versus time. To calculate slope you use rise over run.

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