Speed, Time and distance
Notes of class 8 JNV
Speed
The rate at which a body or an object travels to cover distance is called speed of body. The unit of speed is km/h and m/s.
TIME
The duration in hours, minutes or second spent to cover a certain distance is called the time. The unit of time is hours, minutes and seconds.
DISTANCE
The length of the path travelled by any object or any person between two places is know as distance. The unit of distance is m, km etc.
RELATIONSHIP BETWEEN TIME, SPEED AND DISTANCE
Relation between time, speed and distance is expressed by
speed = distance/time or distance = speed*time
This expression show that
1. Speed is directly proportional to distance.
2. Distance and time are directly proportional.
3. Time is inversely proportional to speed.
AVERAGE SPEED
When a certain distance is covered at speed A and the same distance is covered at speed B,then the average speed during the whole journey is given by 2AB/A+B
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