Module 2: Describing Motion of an Object

 

Distance is how far one thing from one thing.  It can be calculated by multiplying speed by time

Formula:

                Distance  = speed   x  time

 

  For example:

 A bus travelling at an average rate of 50 kilometers per hour made the trip to town in 6 hours. How far does a bus travel?

 

 Distance = 50 kph  x  6 hrs = 300 km

 

 Time can be calculated, by dividing the distance travelled   by an object to its speed.   Seconds (s), minutes (min)and  hours (hr) are examples the standard units of measurement for time .

time===

Formula:

                                 distance

                                 speed

 

For example:

 If Antonio drives his car 45 km per hour and travels a total of  225km.   Calculate the  travelled  time spent  by Antonio ?

time =

                            time =  225 km = 5 hrs

                                           45 k/h

             

Speed can be calculated by dividing the distance covered by an object in motion by the time spent to cover the distance. Meter per second,(m/s) kilometer per hours(kph)

are examples of units used in to express the speed of an object

speed =

      Formula :     

                            speed = distance

                                         time

 

For example:

 John drove to her sister’s house that is 20 meters away from  the market in 10 minutes.  What is the speed of the John’s car?

Speed =                           x                             =                                =  0.33m/s

 

speed = 20 m      x     1 min     x   20 m   =   0.33 m/s

    10 min           60 s            60 s  

       Motion is any change in position relative to a fixed reference point. An   object’s motion is measured in terms of distance and time. Distance is a measure of how far two points are from each other. Time is the duration of an event taking place, or how long the interval is between events.

       A reference point is a stationary object or place that is used to determine whether or not an object is moving or has moved.

    The distance covered by a moving object is affected by its speed, or the measure of how fast it moves. 

The standard unit of measurement for distance is meter. You just add the prefix kilo when you are referring to distance that is quite far. Prefixes like deci, centi, and milli are used if the length is quite short.

 

       A ruler is a tool used for measuring the length of small objects. It has centimeter and millimeter units. You can use a meter stick as an appropriate tool to measure objects that are slightly larger than a piece of paper like the length or width of a table, bed or short    distances.