Question

Explain the terms :

(i) Positive acceleration (ii) Negative acceleration (iii) Zero acceleration​

Answer 1

I) A positive acceleration means an increase in velocity with time. ... If the speed is increasing, the car has positive acceleration. When the car slows down, the speed decreases. When an object is speeding up, the acceleration is in the same direction as the velocity. Thus, this object has a positive acceleration.

II) According to our principle, when an object is slowing down, the acceleration is in the opposite direction as the velocity. Thus, this object has a negative acceleration.An object with negative acceleration could be speeding up, and an object with positive acceleration could be slowing down.

III) If the change in velocity is zero i.e. either the object is at rest or moving with uniform velocity then the object is said to have zero acceleration.Example: a parked car a train moving with a constant speed of 90 km/hr.

Answer 2

1. Positive acceleration= A bus or car moving with increasing speed has positive acceleration. We can say that it is accelerating with the direction of travel.
2. Negative acceleration=In the above example, if we apply the break, the speed of the car decreases. Then it has negative acceleration
3. Zero acceleration is an acceleration, just with zero magnitude. Motion with constant velocity is just a special case of motion with uniform (i.e. zero) acceleration.

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