Is speed and acceleration the same thing?
When velocity is changing, the word acceleration is used. Acceleration is also a vector. You speed up if the acceleration and velocity point in the same direction. You slow down (also referred to as decelerating) if the acceleration and velocity point in opposite directions.
It is thus a vector quantity with dimension length/time². In SI units, acceleration is measured in meters/second². To accelerate an object is to change its velocity, which is accomplished by altering either its speed or direction (like in case of uniform circular motion) in relation to time.
- units. Calculating acceleration involves dividing velocity by time — or in terms of units, dividing meters per second [m/s] by second [s]. Dividing distance by time twice is the same as dividing distance by the square of time. Thus the SI unit of acceleration is the meter per second squared.
- Velocity is always linear, so distance at a given time indicated in m/sec. Speed is also used for a circular motion and then commonly expressed in rpm. Momentum is the result of combined rotary motion and a mass. A flywheel as a mass rotating around an axis has a momentum.
- In a physics equation, given a constant acceleration and the change in velocity of an object, you can figure out both the time involved and the distance traveled. Your acceleration is 26.6 meters per second2, and your final speed is 146.3 meters per second.
Speed has no direction while velocity does. For example, if I say that I'm running at 10 mph, I have given you my speed. If I say that I'm running 10 mph north, then I have given you my velocity. Acceleration is the rate of change in velocity.
- An object accelerates when its velocity changes as a result of increasing speed, decreasing speed, or a change in direction. Like velocity, acceleration has a direction. Acceleration can be represented by an arrow. The figures on the next page show different ways an object can accelerate.
- What is the acceleration of an object that moves at a constant velocity? What is the net force on the object in this case. Acceleration is 0 m/s/s, Net force is zero. An object moving at constant velocity does not accelerate and does not have an unbalanced force acting on it.
- Speed has no direction while velocity does. For example, if I say that I'm running at 10 mph, I have given you my speed. If I say that I'm running 10 mph north, then I have given you my velocity. Acceleration is the rate of change in velocity.
Updated: 2nd October 2019