# What are some examples of acceleration?

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333
Mar 21, 2016

You are accelerating when you change speed or direction.

You change speed when you slow down. So if you slow down at a red light, you are accelerating (often called deceleration or negative acceleration).

You change speed when you go faster. When you are merging onto a freeway and speed up to fit into the flow of traffic you are accelerating.

You accelerate when you turn a corner or go around a curve even if you speed remains the same.

Acceleration is a change in velocity divided by time. Since velocity is speed with direction, a change is either speed or direction is called acceleration.

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EET-AP Share
May 27, 2017

Answer to the secondary question: What law of motion is this?

Newton's Second Law of Motion relates changes in acceleration to changes in forces applied to a mass.

#### Explanation:

In the information about the car slowing down or speeding up, the car is the body that is affected and is the mass. Mass itself is defined as the resistance of a body to change in motion.

So if we want to change the motion of the car mass we will need to apply a force on the car. The force we apply will come from the controls we have over the motion of the car.

If we want to speed up, we apply more gas to go faster. If we want to speed down, we apply the brake to go slower. If we want to speed sideways we turn the steering wheel to change our direction. Each one of these changes in speed of the mass (m) is an acceleration (a) that results from the application of a force (f).

Newton formulated this application with: $F = m a$

The formula indicates direct proportionality between $F$ and $a$ where the $m$ (our car) is constant.

That means as the force $F \uparrow$ then the $a \uparrow$. So if you use the gas pedal properly (no skidding) you can zoom away really fast, and if you jump on the brake, you can stop uncomfortably. Hard turns will make your head spin.

Thanks Newton!

These guys will tell you more:
http://www.physicsclassroom.com/class/newtlaws/Lesson-3/Newton-s-Second-Law

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