In Class 9 Science Chapter 8 Motion is designed with an intention of clarifying doubts and concepts easily. Class 9 solutions in science are beneficial for reference and guiding solutions that help the students to clear doubts instantly, in an effective way.
Motion: Any of the movements are objects from one position to the other position with respect to the observer is called Motion.
Motion Along with the Straight Line: Along with a straight line when an object moves, the motion of the object is known as rectilinear motion. For example; motion of a car on the highway.
Vectors and Scalar Quantities
- which is having both magnitude and direction is a vector quantity. For example, Force, position, etc.
- Scalar is a quantity not associated. For example, Mass, temperature, time, etc.
- The length of path is covered by a moving object at a particular time irrespective of the direction is called distance.
- It is a scalar quantity.
- Its SI unit is the metre(m).
- It is the shortest distance measured from the initial to a final position of an object is known as displacement
- It is a vector quantity.
It is said to be in uniform motion because when the object covers equal distances in equal intervals of time.
Non-uniform motion is known as object covers unequal distances in equal intervals of time,
- Here the distance traveled the object in unit time is referred to as speed.
- It is represented as the: Acceleration = Final velocity-initial velocity / Time
- Its SI unit is metre/ second (m/s).
- It is a scalar quantity.
- The velocity is known as the speed of an object in a particular direction, i.e., it is the displacement of the body in unit time.
- It is represented as – +
- The rate of change of velocity is termed as the acceleration.
- It is represented as:
- The SI unit is metre/ second2(m/s2). And It is a vector quantity.
The acceleration is taken to be positive in the direction of velocity and negative when it is opposite to the direction of velocity.
- Negative acceleration is also named as retardation or deceleration.
- An object moving on a circular path through with uniform speed is always said to be accelerated as it changes its direction every moment.
- Uniform acceleration: When the velocity of the body changes by equal amounts in equal time intervals, acceleration is said to be uniform. For example Motion of a freely falling ball.
- Non – uniform acceleration: When the velocity of the body changes by unequal amounts in equal intervals if time, acceleration is said to be non – uniform. For example Motion of a car.
So we have learned the chapter motion with their explanation of this topic. And moreover you can learn more in your class about this topic.