What is Negative Acceleration? In this section we will study about negative acceleration. But before that let us see what acceleration means. Acceleration is the term given to rate of change of velocity. Any object that has a changing velocity is said to have acceleration. This does not mean that magnitude of velocity should always change. It is also possible to have a change in direction instead of magnitude of velocity as velocity is a vector quantity and possesses both magnitude and velocity. Hence change in velocity can mean either of the following: change in magnitude of velocity change in direction of velocity or change in both direction and magnitude. I like to share this Centripetal Acceleration Formulas with you all through my article.
You might have heard about the car acceleration which is actually the rate at which its velocity increases.
Formula for acceleration is given as:
a = (vf – vi )/t.
Here vf is final velocity of the body and vi is initial velocity. ‘t’ is time taken by the body to change velocity from initial to final.
A question may arise in your mind that Can Acceleration be Negative? Answer is yes. It can be negative. Negative Acceleration is achieved when the change in velocity is negative which means that the velocity of the body should decrease or final velocity should be less than initial velocity. Negative acc is also known as retardation. This can be observed when brakes are applied to a car. The car stops after some time by decreasing its velocity. The rate of change of velocity in this case is negative and hence acceleration observed is negative. This is because the final velocity of the car is less than initial velocity at ever instance after the breaks were applied on the car. Hence car is said to be retarded instead of getting accelerated.
Negative acc can be represented on velocity time graph with a line having negative slope representing decrease in velocity at every instance and hence representing negative acc.
As shown in the graph given below the velocity of the body is being decreased with time. This means that its acceleration is negative.
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Note that acceleration is a vector quantity. Hence if a body moves in negative direction with decreasing speed then its acceleration will be positive while when its speed increases, acceleration will be negative. You can think of it as: the speed of a body increases if the acceleration vector is in the same direction as the direction of motion of the body while speed slows down if vector is pointed in opposite direction.
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