Summary of Average speed & velocity (with examples)

00:00:00 - 00:05:00

The video discusses the calculation of average speed using the formula distance divided by time, and notes that it is important to use the average value since the speed may not have been constant. It also highlights that the standard unit of speed is kilometers per hour, while the standard unit of distance is meters. The concept of velocity is introduced as a measure of the changes in position of an object, with direction specified, and the formula for calculating velocity is given as displacement divided by time. The standard unit of velocity is meters per second.

• 00:00:00 In this section, a man tells a story about his friend who traveled a distance of 18 kilometers in two hours, with a stop at an ice cream shop. To calculate this man's speed, we use the formula distance divided by time, which gives us an average speed of nine kilometers per hour. However, it is important to note that his speed was not constant. He was initially faster, then he slowed down, so the average value was used to calculate his speed. The unit of speed is kilometers per hour, which is not a standard unit since the standard unit of distance is meters.
• 00:05:00 In this section, we learn about the difference between speed and velocity. Velocity differs in that it tracks only the changes in position of an object, and not the distance it travels. To calculate velocity, you take the displacement of an object, which is its position change, and divide it by the time it took for that change to occur. Like speed, the unit of standard measurement for velocity is meters per second. However, unlike speed, velocity has direction, meaning you have to specify where the displacement took place.