# Position-Time Graph: Acceleration

### (I) Positive Acceleration

When distance covered by a moving object goes on increasing with time, the object is said to be have positive acceleration.

### (II) Negative Acceleration

When distance covered by a moving object goes on decreasing with time, the object is said to be have negative acceleration.

### (III) Zero Acceleration

When the moving object covers equal distance in equal time, the object is said to be have zero acceleration.

## Velocity-Time Graph For An Accelerated Motion

### (I) Zero Acceleration

In case of zero acceleration the velocity of the object does not change with time.

### (II) Positive Acceleration

(a) If the object is moving with positive acceleration having zero initial velocity-

(b) If the object is moving with positive acceleration having some initial velocity.

### (III) Increasing Acceleration

In case of increasing acceleration, the velocity of the object goes on increasing exponentially (non linearly).

### (IV) Negative Acceleration

(a) In case of negative acceleration, the velocity of the object decreases linearly with time.

(b) If the object is moving with positive acceleration having some negative initial velocity.