Question

Explain what is positive, negative, and zero acceleration

Answer 1

Hello friend

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Here is your answer!!

⚫ Positive Acceleration

When the velocity of an object increases, the acceleration is positive.In this case, the acceleration is in the direction of Velocity.


⚫ Negative Acceleration

When the velocity of an object decreases with time,it has negative Acceleration.Negative acceleration is also called deceleration.Its directions is opposite to the direction of Velocity.



⚫ Zero Acceleration

If the velocity of the object does not change with time,it has zero acceleration.


I hope this will helps you..


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Answer 2

●Positive acceleration means acceleration in the direction of velocity ( it always increases the speed of particle).
●Negative acceleration means acceleration opposite to the direction of velocity ,it is also known as retardation (it always decreases the speed of the particle).
●Zero acceleration means body is not accelerating, in this case it's velocity is constant .The body moves in a straight line, it neither speed up or down nor change direction .

【 In vector form , if angle between velocity vector and acceleration vector is less than 90° and greater than 0° then it is positive acceleration and if it is less than 180° and greater than 90° then it is negative acceleration. If there is no acceleration vector then it is called zero acceleration. 】

【 If dot product of acceleration vector and velocity vector is positive then positive acceleration and if dot product of acceleration vector and velocity vector is negative then acceleration is negative.
◆If dot product is zero then it will be either zero acceleration or angle between acceleration vector and velocity vector is 90° ( in this case acceleration is going on but here speed is not changing rather only direction of particle is changing)】