# What is motion class 9 physics?

## What is motion class 9 physics?

Motion is a change in position of an object over time. Motion is described in terms of displacement, distance, velocity, acceleration, time and speed. The state of motion of an object is defined by its velocity – that is speed with a direction. Force is the agent which can change the state of motion of the object. • If the position of an object does not change as time passes, then it is said to be at rest. If the position. of an object changes as time passes, then it is said to be in motion. • An object can be at rest with respect to one thing and in motion with respect to some other thing at the. same time. There are four important types of motion : Rectilinear motion, Circular motion, Rotational motion, and Periodic motion. Velocity is essentially a vector quantity. It is the rate of change of distance. It is the rate of change of displacement. Speed of an object moving can never be negative. The velocity of a moving object can be zero. Rectilinear, Circular and Periodic motion For example: Children playing ringa ringa roses or moving in a circle, motion of Earth around the Sun. Periodic Motion : Motion of a object which repeats itself after a certain period of time is called periodic motion.

## How many types of motion are there in class 9 physics?

In mechanics there are four types of motions. It is oscillatory motion, linear motion, rotational motion and circular motion. Was this answer helpful? In the world of mechanics, there are four basic types of motion. These four are rotary, oscillating, linear and reciprocating. Each one moves in a slightly different way and each type of achieved using different mechanical means that help us understand linear motion and motion control. Complex motion means it is not motion to calculate considering a single motion like linear motion, oscillatory motion, vibratory motion, rotatory motion and simple harmonic motion. Because they are combination of more than one type of motions. Newton’s fourth law of motion is related to the nature and calculation of forces. This law states that the forces are vector quantities and they obey the principle of superposition during their vector addition. The rolling motion is a combination of transnational and rotational motion. As we have discussed rolling motion is the combination of transnational and rotational motion so transnational motion is simple motion and rotational motion is complex motion.

## What is motion Class 9 Example?

Movement of any object from one position to another position with respect to the observer is called as Motion. Motion Along a Straight Line: When an object moves along a straight line, the motion of the object is called rectilinear motion. For example; motion of a car on highway. Definition: This type of motion is defined as the motion of an object in which the object travels in a straight line, and its velocity remains constant along that line as it covers equal distances in equal intervals of time, irrespective of the duration of the time. Examples for Rectilinear Motion The use of elevators in public places is an example of rectilinear motion. Gravitational forces acting on objects resulting in free fall is an example of rectilinear motion. Kids sliding down from a slide is a rectilinear motion. The motion of planes in the sky is a rectilinear motion. If an object changes its position with respect to its surroundings with time, then it is called in motion. Mainly, Uniform acceleration, non-uniform acceleration, and average acceleration are the three types of accelerated motions. The term uniform acceleration refers to a motion wherein an object travels in a straight line with an increase in velocity at equal intervals of time. “Rotational motion can be defined as the motion of an object around a circular path, in a fixed orbit.” The dynamics for rotational motion are completely analogous to linear or translational dynamics. Many of the equations for mechanics of rotating objects are similar to the motion equations for linear motion.

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## What is rotatory motion class 9?

Answer: Solution: Rotatory motion: if the body moves about a fixed axis without changing the radius of its motion, it is said to be rotatory motion. Examples: a spinning wheel. Motion may be divided into three basic types — translational, rotational, and oscillatory. General motion is a combination of linear and rotary motions. General motion is the most common type of motion in sport and physical exercise. Oscillatory motion is defined as the to and fro motion of the body about its fixed position. Oscillatory motion is a type of periodic motion. Examples of oscillatory motion are vibrating strings, swinging of the swing etc. Thus, the earth has three types of motion at the same time i.e. circular motion, periodic motion and rotational motion.

## What is the simplest type of motion class 9?

The simplest type of motion is the motion along a straight line. The first law of motion states that an object at rest stays at rest and an object in motion stays in motion with the same speed and in the same direction unless acted upon by an unbalanced force. State of Rest and State of Motion. A freely falling body moves under the acceleration due to gravity and therefore, its acceleration is constant. So, it is a uniformly accelerated motion.

## What is motion Class 9 notes?

An object is said to be in motion when its position changes with time. We describe the location of an object by specifying a reference point. Motion is relative. The total path covered by an object is said to be the distance travelled by it. In physics, motion is the change in position of an object with respect to its surroundings in a given interval of time. The motion of an object with some mass can be described in terms of the following: Distance. Displacement. Velocity is defined as the rate of displacement. Acceleration is known as the rate of change of velocity. The motion of an object, which is projected or thrown, is known as the projectile motion. The projectile motion can take place in any situation. Under a gravitational field when the air resistance is not present, projectile motion can be considered as a free fall.