# Relationship among velocity speed and direction

### Speed and Velocity

This is one of the essential differences between speed and velocity. Speed is a scalar quantity and does not keep track of direction; velocity is a vector quantity. Explain the relationships between instantaneous velocity, average velocity, instantaneous speed, . One major difference is that speed has no direction. Get an answer for 'What's the difference between speed and velocity?' and find Velocity is the rate at which an object changes position in a certain direction.

Displacement, however, not only refers to the distance between two places but their relative locations as well. Say you walk 5m to the east, for example. At this point, your displacement and distance covered would both be 5m.

## Speed and Velocity

If you were to turn around and walk 5m back west, you would have walked a distance of 10m. Your displacement, however, would be 0m because your position has not changed. If you were only to walk back 3m, your displacement would be 2m. See Image 1 Speed vs.

### The Relationship Between Velocity and Acceleration. by Katie Crocker on Prezi

Speed is a measure of how quickly something is moving, but it does not consider the direction in which the movement is happening. Velocity, on the other hand, takes into consideration displacement and time taken for that displacement. The equation for velocity is very similar to the equation for speed: Even though the equations are very similar, they can produce very different results.

Let's use the example from before. If it takes you 3 seconds s to walk 5m to the east, your speed and velocity are the same number: Your velocity would be stated as 1. Displacement is not just measured back and forth, however.

It can be measured in two or three dimensions. If a person in motion wishes to maximize their velocity, then that person must make every effort to maximize the amount that they are displaced from their original position.

Every step must go into moving that person further from where he or she started.

For certain, the person should never change directions and begin to return to the starting position. Velocity is a vector quantity. As such, velocity is direction aware. When evaluating the velocity of an object, one must keep track of direction. One must include direction information in order to fully describe the velocity of the object. This is one of the essential differences between speed and velocity.

## Speed & Velocity

Speed is a scalar quantity and does not keep track of direction; velocity is a vector quantity and is direction aware. Determining the Direction of the Velocity Vector The task of describing the direction of the velocity vector is easy.

• Direction and speed: velocity

The direction of the velocity vector is simply the same as the direction that an object is moving. It would not matter whether the object is speeding up or slowing down. If an object is moving rightwards, then its velocity is described as being rightwards.

If an object is moving downwards, then its velocity is described as being downwards. Note that speed has no direction it is a scalar and the velocity at any instant is simply the speed value with a direction.

### Displacement, velocity, acceleration

Calculating Average Speed and Average Velocity As an object moves, it often undergoes changes in speed. For example, during an average trip to school, there are many changes in speed. Rather than the speed-o-meter maintaining a steady reading, the needle constantly moves up and down to reflect the stopping and starting and the accelerating and decelerating. The average speed during an entire motion can be thought of as the average of all speedometer readings.

If the speedometer readings could be collected at 1-second intervals or 0. Now that would be a lot of work. And fortunately, there is a shortcut. The average speed during the course of a motion is often computed using the following formula: In contrast, the average velocity is often computed using this formula Let's begin implementing our understanding of these formulas with the following problem: While on vacation, Lisa Carr traveled a total distance of miles.

Her trip took 8 hours. What was her average speed? To compute her average speed, we simply divide the distance of travel by the time of travel. Lisa Carr averaged a speed of 55 miles per hour. Yet, she averaged a speed of 55 miles per hour. The above formula represents a shortcut method of determining the average speed of an object.

Average Speed versus Instantaneous Speed Since a moving object often changes its speed during its motion, it is common to distinguish between the average speed and the instantaneous speed.