# How does speed interact with acceleration?

Acceleration is the rate at which speed changes, at least scalarly.

### The speed at which an object falls and the acceleration at which it falls are always the same value?

### How can acceleration be constant if it is an increase in speed?

Exactly the same way that the speed can be constant but the distance keeps increasing. If the acceleration happens to be an increase in speed, then "constant" acceleration means that the speed will increase just as much in the 7th minute, for example, as it increased in the 4th minute, for example, etc. Acceleration can be the rate at which speed changes. So if the acceleration is constant, then the speed is changing at a…

### What do speed and acceleration have in common?

Speed is how fast you are moving. Acceleration is the rate at which speed is changing. In strict physical terms, acceleration is the difference between the ending and starting speed divided by the time over which the change occurred. In that sense the word can mean that speed is increasing (positive acceleration), decreasing (negative acceleration), or not changing (zero acceleration). However in common usage, negative acceleration is usually called deceleration. Acceleration can be calculated as…