# List of physics formulas class 11 chapter Kinematics for CBSE ,IIT JEE & NEET

#### Physics Formulas

Kinematics is the study of the motion of the body system without directly considering the potential forces or fields that affect movement. In other words, kinematics examines how energy and momentum are distributed between interconnected bodies. In many of the interactions discussed, there is a two-way interaction, in the sense that it involves two interacting entities: the projectile in the target.

Another necessary consequence of the interaction of two bodies is a single plane consisting of two interacting particles. Therefore, there will be no component of pressure in the interactive plane. Therefore, the two bodies from the interaction should be in the same plane. Thus, the interaction of the two bodies has two sides.

Moreover, with only two bodies, one can easily define the mass center where the incident and the emerging particles rotate. The center of mass is that the total moment of the mass (X distance of the mass from the center-of-mass) is zero. Therefore, the center of mass is also that the total momentum (mass × velocity) is equal to zero. This maintains the balance of momentum. Thus, kinematic analysis was performed in the center of mass

## Distance:

Distance is the the movement of everything without looking at the direction. We can define a distance to the extent to which an object is covered by the ground in spite of its starting or ending point.

Distance is a scalar quantity.

### Displacement:

Displacement is known as a change in the position of an object. It is a vector quantity and has both direction and magnitude. It is represented as an arrow that points from the first position to the endpoint.

Example- If an object moves from A to B, then the position of the object changes. This change in the position of an object is known as Displacement.

Examples:

Q1. An object moves 3.5 times around a circular path of radius 90 m. Calculate its displacement.

Solution: Given,

Radius, r = 90 m

Distance, S = 2πr x n = 2 x 22/7 x 90 x 3.5 = 1978.2

Displacment, (S) = 2r = 2 x 90 = 180 m

Q2. A car is moving on a circular track of radius 60m. Calculate the distance and displacement made when the car reaches to opposite end of the track.

Solution: Here,

r = 70m

Distance, S = 2π/2

= 22/7 x 60

= 188.4m

Displacement S = 2r

= 2 x 60

= 120m

### Speed:

The rate of distance travelled by a body is known as speed.

Speed = Distance/time

### Velocity:

The rate of displacement is known as velocity.

velocity = displacement/time

Velocity is vector quantity.

Both speed and velocities have same units and dimensions.

### Average speed

= total distance travelled / total time

= Distance travelled = Average speed x time s

= v x t

### Average Velocity

= resulant displacement / time

Resultant displacement = Average velocity x time

If a body cover first half of the total displacement with a velocity v1 and second half with velocity v2. Then the average velocity is given by

### Instantaneous velocity:

The velocity of a body at any particular instant in its journey is known as instantaneous velocity.

Vinst = ds / dt

### Relative velocity :

velocity of one body with respect to that of another body is called relative velocity. The velocity of ‘A’ with respect to that of ‘B’ is given by

If ‘A’ and ‘B’ are moving with speed VA +VB at an angle with one another.

### Acceleration:

The rate of change of velocity of a body is called acceleration.

The direction of acceleration lie along the direction of change in velocity.

### Retardation:

The negative acceleration is known as retardation.

### Equations of motion

U = initial velocity,

v = final velocity

A = acceleration,

s = displacement,

T = time of travel

Where Sn is the distance travelled in nth second of its journey

Equations of motion of a freely falling body (take u = 0 and a = g)

Academic team of Physics Wallah prepared short notes and all important Physics formulas and bullet points of chapter Kinematics class 11. Do check out the NCERT Solutions for class 11 physics section.

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Download all formula of Kinematics class 11 pdf given below