## Difference between displacement and angular displacement

We have already discussed the difference between distance and displacement. Let us today discuss the difference between displacement and angular displacement. We will also discuss the difference between velocity and angular velocity. Continue reading “Difference between displacement and angular displacement”

## Object having zero velocity but still accelerating

We all know that acceleration is rate of change of velocity. Thus according to this definition, if the velocity of the object is zero or constant, then its acceleration will be zero. But there are certain things in life where only definitions can not define another parameter but these parameters or things may be explained using certain logic. Continue reading “Object having zero velocity but still accelerating”

## Relation between initial velocity, final velocity and acceleration

Let us derive the relation between the initial velocity, final velocity and acceleration.

Suppose a body has an initial velocity u and is moving with uniform acceleration a.

Let the final velocity of the body after time t = v.

a = dv/dt

Or                                                              dv = adt                                               …(i) Continue reading “Relation between initial velocity, final velocity and acceleration”

## Acceleration, average Acceleration, uniform Acceleration, variable Acceleration, instantaneous Acceleration

Acceleration: The state of change of velocity of a body with time is known as its acceleration.

If the velocity of a body increases with time, then its acceleration is positive. On the other hand, if the velocity of a body decreases with time, then its acceleration is negative. Negative acceleration is also called retardation or deceleration. Acceleration is a vector quantity.

Units of acceleration. The units of acceleration are: Continue reading “Acceleration, average Acceleration, uniform Acceleration, variable Acceleration, instantaneous Acceleration”

## Velocity, average velocity, uniform velocity, variable velocity, instantaneous velocity

Let us discuss the definitions of velocity, uniform velocity, average velocity, variable velocity and instantaneous velocity

Velocity: The time rate of change of position of a body in a particular direction is known as its velocity.

Or

The time rate of change of displacement of a body is known as its velocity.

i.e.                                            Velocity = displacement/time Continue reading “Velocity, average velocity, uniform velocity, variable velocity, instantaneous velocity”

## Speed, Uniform speed, Variable speed, average speed, Instantaneous speed

Let us discuss the definitions of speed, uniform speed, variable speed, average speed and instantaneous speed in the following section:

1. Speed: The time rate of change of position of a body in any direction is known as its speed.

It is measured by the ratio of the distance by a body to the time in which this distance is covered

i.e.                                                        Speed = distance/time

Speed is a scalar quantity. It is either positive or zero but never negative.

Units of speed: We know that,

Speed = Distance/Time

Units of speed = Units of distance/Units of time

In the CGS system, unit of speed is cms-1 and in the MKS system or SI units the unit of speed is ms-1. Continue reading “Speed, Uniform speed, Variable speed, average speed, Instantaneous speed”

## Distance and Displacement Difference

You must have heard the terms distance and displacement. Let us discuss the difference between the two. We will also discuss the characteristics of displacement.

1. Distance: The actual length of the path covered by a body in moving from one position to another is called distance traveled by the body. Suppose you move in a square shaped ground (each side 100 m) from east to west, then from west to east at the same point. The total distance covered will be 200 m. It is a scalar quantity. It is measured in centimeters (cm) in the CGS system and in metres (m) in the M.K.S system or SI units. The distance covered by a body in motion can never be zero or negative. Continue reading “Distance and Displacement Difference”

## Examples of motion in one, two and three dimensions

To find the examples of motion in one, two and three dimensions, let us first understand the motion in one, two and three dimensions:

1. Motion in one dimension:

The motion of a body is said to be in one dimension or one –dimensional motion if it moves along a straight line in any direction. This type of motion is also called rectilinear or linear motion. Only one position co-ordinate is required to describe the position of the particle in this motion. Continue reading “Examples of motion in one, two and three dimensions”

## Mechanics and its types

Today we will discuss the mechanics and its types:

Mechanics

The branch of physics which deals with the study of motion of material objects is called mechanics.

Mechanics can be classified into the following three main branches:

Statics: It is that branch of mechanics which deals with the study of objects at rest. In this branch, we study the motion of objects under the effect of forces in equilibrium. Time factor has no role to play in statics. Continue reading “Mechanics and its types”