SI Unit Of Velocity


When two objects are in motion in the same direction, you can determine the speed easily by its motion. If the objects are moving in opposite and if you want to determine the speed, finding the velocity of the object comes into the picture.

The velocity of an object is defined as the rate of change of the position of the object with respect to a frame of reference and is a function of time. Velocity is equivalent to a specification of an object’s speed and direction of motion. Velocity is the prime indicator of the position of the object as well as the speed of the object.

The velocity of the object is determined by

V= d/t


d= displacement

t= change in time

SI unit of velocity is given by meter per second (ms-1).

Average Velocity

Average Velocity is defined as the rate of change of position of the body with respect to time of travel.

The average velocity of the body is given by:

Average Speed =  Distance Traveled/Time of Travel


Δx = is the change in position or displacement

Finally, the average velocity is given by

X2 = final position of the object

X1 = initial position of the object

Now let’s know about centripetal force along with examples

Centripetal Force

Have you ever wondered what makes planets and stars to move around the orbit in a circular path??

The answer is the Centripetal Force. The centripetal force keeps these planets, stars and other astronomical objects to move around the orbit.

Any net force responsible for creating uniform circular motion is known as centripetal force.  In simple terms, it can be explained as the body moving in a circular path by constantly changing its direction i.e. it is constantly accelerating. Using Newton’s second law of motion, if the component of force acting on a body in a circular motion that is directed toward the center of curvature or axis of rotation.

Centripetal Force Examples

The force that pulls or pushes an object toward the center of a circle as it travels, causing angular or circular motion is called a Centripetal Force. Centripetal Force Examples are given below.

  • Spinning a ball on a string: Centripetal force is seen by the force of tension on the rope that pulls the object in towards the center.
  • Turning a car: Centripetal force is provided by the frictional force between the ground and the wheels.
  • Planets moving around the Sun along the orbit: Centripetal Force is seen in the form of Gravity.

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