### ACCELERATION

It is the rate of change of velocity with time. Its SI unit is m/s².
If the velocity of an object increases without change in direction, it is said to be moving with positive acceleration.
If the velocity of an object decreases without change in direction, the object is said to be moving with negative acceleration or deceleration or retardation.
Acceleration of an object is zero, if it is at rest or moving with uniform velocity.
An object is said to be moving with uniform acceleration, if its velocity changes by equal amounts in equal intervals of time.
An object is said to be moving with a variable acceleration, if its velocity changes by unequal amounts in equal intervals of time.
Formula: Re-arrange the equation F = ma to solve for acceleration. You can change this formula around to solve for acceleration by dividing both sides by the mass, so: a = F/m. To find the acceleration, simply divide the force by the mass of the object being accelerated.

#### SCALAR AND VECTOR QUANTITIES

A physical quantity which is completely described by magnitude only is known as scalar quantity. e.g., time distance,mass,speed,area,volume,work,power.pressure,charge and length.
A physical quantity which is completely described by its magnitude as well as direction is known as vector quantity. e.g., displacement,velocity,acceleration,force,weight,torque,momentum and electric field.

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