Mechanics

Kinematic Equations in Physics List

5 kinematics equations
5 kinematics equations

Kinematics is the branch of mechanics dealing with the motion of bodies without reference to mass or force. There are three kinematic equations in Physics for bodies moving with uniform acceleration. These equations relate initial velocity, final velocity, acceleration, time, and distance covered by a moving body.
For equations of motion derivation, we assume that the motion is along a straight line. Hence, we consider only the magnitude of displacements, velocities, and acceleration.

List of Kinematic Equations in Physics

 

The first equation of motion derivation by graphical method

Consider a body moving with initial velocity Vi in a straight line with uniform acceleration a. Its velocity becomes Vf after time t. The motion of the body is described by the speed-time graph represented by line AB. The slope of line AB is acceleration a. The total distance covered by the body is shown by the shaded area under the line AB. Kinematic equations of motion can be obtained easily from this graph.

kinematics equations
Speed Time Graph

Speed time graph for the motion of a body is shown in the figure. The slope of line AB gives the acceleration of a body.

First Equation of motion Derivation

See Also: Newton laws of motion

The second equation of motion derivation by graphical method

Consider a body is moving with initial velocity ‘Vi’ in a straight line with uniform acceleration ‘a’.Lets its velocity becomes ‘Vf’ after time t. The motion of the body is described by the speed-time graph by line AB as shown in the figure below. The total distance ‘S’ is covered by the body is equal to the total area OABD under the graph.

kinematics equation 1

 

It is known as the 2nd equation of motion.

second equation of motion derivation 1

Third (3rd) equation of motion by graphical method

Consider a body moving with initial velocity ‘vi’ in a straight line with uniform acceleration ‘a’.Let its velocity becomes Vf after time ‘t’.The motion of the body is described by the speed-time graph as shown in the figure by line AB. The total distance ‘S’traveled by the body is given by the total area OABD under the graph.

third equation of motion derivation 1

third-equation of motion 1 derivation

It is 3rd equation of motion.
The conditions under which these equations can be applied:
1: Motion should be 1-dimensional.
2: Acceleration should be uniform.
3: Frame of reference should be inertial.
Related topics:

Related Articles

3 Comments

Leave a Reply

Your email address will not be published. Required fields are marked *

Back to top button

Adblock Detected

Please consider supporting us by disabling your ad blocker