# Acceleration and velocity relationship with

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

Displacement, velocity, acceleration. Kinemetics is the description of motion; it concerns only the accurate description of the positions of objects, and the change . Understand Relation between Acceleration velocity and displacement. Anil Kumar. Loading Unsubscribe from Anil Kumar? Cancel. Time is the medium for both velocity and acceleration to occur. Another relationship between the two is that when velocity is constant.

Velocity can be constant, or it can change acceleration.

### What is acceleration? (article) | Khan Academy

Speed with a direction is velocity. You will use a lot of vectors when you work with velocity. Our real world example of navigation on the ocean used velocity for every vector.

Velocity is a vector measurement because it has an amount and a direction. Speed is only an amount a scalar. Speed doesn't tell the whole story to a physicist.

Think of it another way. If I tell you I'm driving north and ask you how long until we get to the city. You can't know the answer since you don't know my speed. You need both values. One Moment in Time There is a special thing called instantaneous velocity. That's the velocity at a split second in time. Above, we were talking about your speed and direction over a long period of time.

You can imagine this as driving down a straight road but keeping your speedometer on the same value. A constant acceleration is quite different. The acceleration due to gravity on the Earth has the constant value 9.

## How are acceleration, time and velocity related?

The velocity starts low, but increases by 9. However, acceleration is the key characteristic here, not velocity. Velocity and Momentum The equation for momentum uses velocity instead of acceleration.

Their definitions are different, and this shows how those differences lead to distinct equations in practice. Speed, Velocity and Acceleration About the Author Lee Johnson is a freelance writer and science enthusiast, with a passion for distilling complex concepts into simple, digestible language.

In Example D, the object is moving in the negative direction i.

## Velocity, Speed, and Motion... Oh My!

Thus, this object also has a negative acceleration. Observe the use of positive and negative as used in the discussion above Examples A - D. In physics, the use of positive and negative always has a physical meaning. It is more than a mere mathematical symbol.

As used here to describe the velocity and the acceleration of a moving object, positive and negative describe a direction. Both velocity and acceleration are vector quantities and a full description of the quantity demands the use of a directional adjective. North, south, east, west, right, left, up and down are all directional adjectives. Consistent with the mathematical convention used on number lines and graphs, positive often means to the right or up and negative often means to the left or down.

So to say that an object has a negative acceleration as in Examples C and D is to simply say that its acceleration is to the left or down or in whatever direction has been defined as negative. Negative accelerations do not refer acceleration values that are less than 0.

We Would Like to Suggest Sometimes it isn't enough to just read about it. You have to interact with it!

And that's exactly what you do when you use one of The Physics Classroom's Interactives.