Motion : Class 9 Notes , Part 1

 Notes :- Motion,Physic[ Part 1]

 

 

CBSE Class 9 physic motion study notes . Students can get the concept of Motion, Distance, Displacement, and some important mathematics based on this topic (t ) within short time. All study notes at Damn Education are free and can be learn any time any where . Access here free study notes. Go through the study notes as many number of times without any charge based on updated from CBSE  .

Topic covered :

1. Motion

2. Reference point or Origin

3. Scalar and Vector quantity

4. Distance

5. Displacement

 

 

 

Motion :

· Motion is the movement of the body from on place to another with respect to time and surrounding of the body is called motion.

· Example : A car is moving in  a path. As the surrounding ( House, tree, etc.)of the car is rest that’s why we are saying car is in motion.

 

Reference point:

· A point which help us to describe a body which is in motion us called reference point or origin.

· Example :

From the given picture we can see a car is moving from Point A to Point B. So, we will say car is moving with respect to house and tree . Here, reference point is tree and house .

Scalar and Vector :

· Scalar is the physical quantity which have magnitude (or size) .

· Example : A. Car had moved 24 km. It  is a scalar quantity because it only has magnitude (24) quantity.

· Vector is physical quantity which have magnitude as well as direction.

· Example :  A car is moving 4 km in North. Here, direction (North) and magnitude (4 ) both are given .  So it is vector quantity.

Distance:

· Distance travel by a body is the actual length of the path covered by a moving body irrespective of direction.

· It is a scalar quantity.

· SI unit of distance is meter ( m).

· Example:

In the given picture we can see a person is moving from BC to CA. So,  Distance is BC +CA

Distance = BC+CA

=4m+5m

=9m

Displacement :

 

· When a body moves from one place to another , the shortest distance between initial and final position with respective direction is called displacement.

· It is vector quantity as it has both direction and magnitude.

· SI unit of displacement is meter (m) same as distance.

· Example:

From the given picture , a person is moving A to B then B to C and C to D. So, here the displacement is shortest distance . Thus, the Shortest distance is AD .

Displacement = Shortest distance

Displacement= AD

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