# Why is the speed denoted by V.

## Physics speed

In this article, we will deal with speed from the point of view of physics. We explain to you how to calculate the speed in physics and provide you with the appropriate formulas. This article belongs to the field of physics or mechanics.

First of all, a distinction must be made between the type of movement present in order to then be able to calculate the speed. This is a typical task in the field of physics. We now start with the uniform movement and then look at the uniformly accelerated movement.

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### What is uniform motion?

Uniform motion has the following properties:

• The speed of the object is always the same
• The acceleration a is zero (a = 0), i.e. the object is neither decelerated nor faster

Or expressed as an example: You are driving on a road at 100 km / h. As long as you really drive the 100km / h, this is a uniform movement. If the speed changes, however, you no longer have a uniform movement.

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### Physics: speed of uniform motion

The formula of uniform motion sets the information Distance, speed, time and starting distance in relation to each other. The following is the general formula for calculating the speed in physics for uniform movements, as well as the meaning of the symbols. Then we will provide you with some explanations and examples for a better understanding.

Uniform motion formula:

• s = v t + s0
• "s" is the distance in meters [m]
• "v" is the speed in meters per second [m / s]
• "t" is the time in seconds [s]
• "s0"is the starting distance in meters [m]

In very many cases the starting path does not exist. This simplifies the formula too

s = v · t.

### Speed ​​(uniform movement): examples

Time for a few small examples of uniform movement. One thing is very important: you have to insert the numbers in the form in which they were given in the formula. Say the distance in meters and not in kilometers or centimeters. Or the time in seconds and not in hours. If you don't pay attention to this, you will quickly get crap out of arithmetic.

Example 1:

Example 2:

### Speed ​​and accelerated movement

Now let's take care of the uniformly accelerated motion from a physics point of view. This has the following properties:

• The speed of the object changes, becomes either faster or slower
• This means that the acceleration - usually denoted by "a" - is not equal to zero
• The acceleration is always constant in the case of a uniformly accelerated movement

So again: the acceleration is always the same. Example: a = 5m / s2. This means that the object is moving at 5m / s2 accelerated. "A" does not change during the movement, otherwise the acceleration would no longer be uniform.

### Calculate uniformly accelerated movement (formula)

There are three laws of uniformly accelerated motion that also allow the calculation of speed. These laws also provide information too Distance, acceleration, time, initial speed and initial distance.

Formula uniformly accelerated movement (distance-time law):

• s = 0.5 a t2 + vO · T + s0
• "s" is the distance in meters [m]
• "a" is the acceleration in meters per second square [m / s2]
• "t" is the time in seconds [s]
• "s0"is the starting path [m]

If the movement starts from a standstill and from the starting point, the formula simplifies to: s = 0.5 a t2

Formula uniformly accelerated movement (speed-time law):

• v = a t + v0
• "v" is the speed in meters per second [m / s]
• "a" is the acceleration in meters per second square [m / s2 ]
• "t" is the time in seconds [s]
• "v0"is the initial speed in meters per second [m / s2 ]

If the movement begins without a start speed, the formula is simplified to: v = a * t
Formula uniformly accelerated movement (acceleration-time law):

• a = constant
• "a" is the acceleration in meters per second square [m / s2]

### Evenly accelerated movement: examples

Time to calculate one or the other example of uniformly accelerated movement including speed.

Example 1:

Example 2:

### Conversion of units

Many students have problems converting units. For this reason, we are going to give you a brief summary of the most important conversion rules.

• 100cm = 1m = 0.001km
• 1m / s = 3.6km / h

With this information, the calculation of the speed in physics should succeed for common examples. However, we have not discussed the uneven acceleration here.

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