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Physics Lesson 3.11.3 - Why we cannot use the concept of Scalar Acceleration

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Welcome to our Physics lesson on Why we cannot use the concept of Scalar Acceleration, this is the third lesson of our suite of physics lessons covering the topic of Acceleration v's Time Graph, you can find links to the other lessons within this tutorial and access additional physics learning resources below this lesson.

Why we cannot use the concept of Scalar Acceleration

The acceleration discussed so far is a vector quantity as its value could also be negative. This means it involves the direction. But what happens if we are not interested in the direction but only in the magnitude of the acceleration?

In this case, we are concerned only whether the object is speeding up or slowing down. Therefore, we are interested only in the change in speed in the unit of time. We have

a = v - v0/t

If we use the vertical flipping method as discussed in the Position vs Time to Distance vs Time conversion or in the Velocity vs Time to Speed vs Time conversion, we would obtain the flowing graphs:

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You have reach the end of Physics lesson 3.11.3 Why we cannot use the concept of Scalar Acceleration. There are 5 lessons in this physics tutorial covering Acceleration v's Time Graph, you can access all the lessons from this tutorial below.

More Acceleration v's Time Graph Lessons and Learning Resources

Kinematics Learning Material
Tutorial IDPhysics Tutorial TitleTutorialVideo
Tutorial
Revision
Notes
Revision
Questions
3.11Acceleration v's Time Graph
Lesson IDPhysics Lesson TitleLessonVideo
Lesson
3.11.1Acceleration verse Time graph in Uniform motion
3.11.2Acceleration verse Time graph in the uniformly accelerated (decelerated) motion
3.11.3Why we cannot use the concept of Scalar Acceleration
3.11.4Vector acceleration verse time graph and the hypothetical corresponding scalar acceleration vs time graph for the same motion
3.11.5What happens if the acceleration is not constant?

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  6. Continuing learning kinematics - read our next physics tutorial: Motion in Two Dimensions. Projectile Motion

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