# SSC CGL Physics Notes: Part 1 – Motion

Questions on General Science form the bulk of the General Awareness Questions asked in SSC CGL Tier 1 Exam. 9 to 10 Questions out of the total 25 questions on General Awareness are asked on topics from General Science. Therefore, to assist you with your SSC CGL preparation, we would be providing you with notes on various topics from Physics, Chemistry and Biology. Our Today’s blog is SSC CGL Physics Notes: Part 1 – Motion. Read on to know about Speed, Velocity, Acceleration and more.

## SSC CGL Physics Notes – Motion

#### SSC CGL Physics Notes – Scalar Quantities:

Physical quantities which have only magnitude and no direction are called scalar quantities.
Example: Mass, speed, volume, work, time, power, energy etc.

#### SSC CGL Physics Notes – Vector Quantities:

Physical quantities which have both magnitude and direction, and which obey the triangle law are called vector quantities.
Example: Displacement, velocity, acceleration, force, momentum, torque etc.

#### SSC CGL Physics Notes – Distance

• It is the actual path travelled by a body, irrespective of its direction in a given period of time.
• It is a Scalar Quantity.

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#### SSC CGL Physics Notes – Displacement

• The change in the position of the object in a given period of time.
• Distance is a scalar quantity whereas displacement is a vector quantity both having the same unit (metre).
• Displacement may be positive, negative or zero whereas distance is always positive.

#### SSC CGL Physics Notes – Speed:

• Distance travelled by the moving object in unit time interval is called speed.
• Speed = Distance/ Time
• It is a scalar quantity and its SI unit is meter/second (m/s).
• The speed of an object at any instant is called instantaneous speed.

Variable Speed

• A body covering unequal distance in equal interval of time will have Variable Speed.
• Acceleration will always be present with the body moving at a Variable Speed

Uniform Speed

• A body covering equal distance in equal interval of time will have Uniform Speed
• Acceleration may or may not be present with Uniform speed.

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#### SSC CGL Physics Notes – Velocity:

• The velocity of a moving object is defined as the displacement of the object in unit time interval i.e., velocity = Displacement/Time
• It is a vector quantity and its SI unit is meter/second.

Uniform Velocity

• If a body goes equal displacement in equal interval of time, then it is called uniform velocity

Variable Velocity

• If a body undergoes unequal displacement in equal interval of time, then it is called variable velocity.

Relative velocity
= V1 +V2 if two travels are in opposite direction
=V1-V2 if two travels are in the same direction

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#### SSC CGL Physics Notes – Acceleration:

• Acceleration of an object is defined as the rate of change of velocity of the object.
• It is a vector quantity and its SI unit is meter/second2 (m/s2)
• If velocity decreases with time which is negative acceleration, then it is called retardation.

Variable Acceleration

• If Velocity of body changes in different amounts during the same intervals of time, the acceleration of the body is called as Variable Acceleration
• Acceleration is variable if either of its direction or magnitude changes with respect to time.

Uniform Acceleration

• If the velocity of the body changes by the same amounts in same intervals of time, then the acceleration of the body is known as Uniform Acceleration.

Constant Acceleration

• If the Acceleration of the Body does not change with time, then it is called Constant Acceleration.

Acceleration Equations –

V=u+at

S=ut+at2/2

V2= u2+2as

Here,

V = final velocity

u = initial velocity

t = time interval

a = acceleration

s = distance travelled.

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#### SSC CGL Physics Notes – Circular Motion:

• The motion of an object along a circular path it is called circular motion.
• If the object moves at uniform speed, its motion is uniform circular motion.
• Uniform circular motion is an accelerated motion because the direction of the velocity changes continuously.

#### SSC CGL Physics Notes – Angular Displacement and Velocity:

• The angle subtended at the centre of a circle by a body moving along the circumference of the circle is called angular displacement of the body.
• Angular displacement= length of arc/radius of circle
• The time rate of change of angular displacement is called angular velocity.
It is generally denoted by ω.

That was all in This part of SSC CGL Physics notes. We hope you study the information provided here carefully and use it to score well in your SSC CGL 2018 Exam.

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