# What is motion Class 9 explanation?

Motion is a change in position of an object over time. Motion is described in terms of displacement, distance, velocity, acceleration, time and speed.

## What is motion full explanation?

motion, in physics, change with time of the position or orientation of a body. Motion along a line or a curve is called translation. Motion that changes the orientation of a body is called rotation.

## What is motion in physics class 9 examples?

The motion of the earth about its own axis around the sun is an example of rotary motion. While driving a car, the motion of wheels and the steering wheel about its own axis is an example of rotatory motion.

## What is motion in Ncert Class 9?

Movement of any object from one position to another position with respect to the observer is called as Motion.

## What is the unit of motion?

The SI unit of velocity is m/s.

## What are motions 4 examples?

The free movement of a body with respect to time is known as motion. For example- the fan, the dust falling from the carpet, the water that flows from the tap, a ball rolling around, a moving car etc. Even the universe is in continual motion.

## What is the first law of motion?

1. Newton’s First Law of Motion (Inertia) An object at rest remains at rest, and an object in motion remains in motion at constant speed and in a straight line unless acted on by an unbalanced force.

## What causes motion?

A: Forces cause motion. To move something, you need to apply a push or a pull, which is, by definition, a force. Without a force, the object will be immobile, or keep moving without speeding up.

## Who Discovered motion?

Motion is the area of physics that studies how things move. It was developed about 300 years ago by Isaac Newton.

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

The simplest type of motion is the motion along a straight line.

## What is difference between speed and velocity?

Speed is the time rate at which an object is moving along a path, while velocity is the rate and direction of an object’s movement. Put another way, speed is a scalar value, while velocity is a vector.

## Is speed can be zero?

The average speed cannot be zero unless the body is stationary over a given interval of time. Average speed is the ratio of the total distance travelled by a body to the total time interval taken to cover that particular distance. However, an average velocity can be zero.

## What is the formula of displacement?

Displacement = Final position – initial position = change in position.

## What is rest and motion?

Rest: An object is said to be at rest if it does not change its position with respect to its surroundings with time. Motion: An object is said to be in motion if the position changes with respect to it surrounding and time.

## What are the 7 basic SI units?

• Length – meter (m)
• Time – second (s)
• Amount of substance – mole (mole)
• Electric current – ampere (A)
• Temperature – kelvin (K)
• Luminous intensity – candela (cd)
• Mass – kilogram (kg)

## What is SI unit of speed?

The SI unit of speed is given in terms of basic units of distance and time. Thus, the SI unit of speed is metre per second or m/s.

## What is the quantity of motion?

The quantity of motion or the momentum, →p, of the object is defined to be the product of the mass and velocity. →p=m→v. Momentum is a reference frame dependent vector quantity, with direction and magnitude. The direction of momentum is the same as the direction of the velocity.

## What is the importance of motion?

Motion strengthens your muscles to better support your body. It also provides movement to your joints and strengthens your bones. In addition, motion provides a release of hormones that makes you feel good, so it positively affects your mental health.

## What are the uses of motion?

2) Everything you use things that is around you like fan, refrigerator etc all works on the laws of thermodynamics and other physics principles. 3)Walking is not possible without friction and we know this because of Newton’s first law of motion , the component of weight mgsin theta is the one which help us in walking..

## What are the types of force?

• Applied Force.
• Gravitational Force.
• Normal Force.
• Frictional Force.
• Air Resistance Force.
• Tension Force.
• Spring Force.

## What is Newton’s 2nd law called?

The other name for Newton’s second law is the law of force and acceleration.

## What is Newton’s law formula?

Newton’s second law, which states that the force F acting on a body is equal to the mass m of the body multiplied by the acceleration a of its centre of mass, F = ma, is the basic equation of motion in classical mechanics.

## What is Newton’s 3rd law?

Newton’s third law simply states that for every action there is an equal and opposite reaction. So, if object A acts a force upon object B, then object B will exert an opposite yet equal force upon object A.

## What is a state of motion?

State of motion: The state of motion of an object is defined by the speed with direction relative to a particular frame of reference or another object. When the position of a body concerning its surroundings changes with time, it is said to be the object is in motion.

## What are the 5 main types of forces?

• Gravitational force.
• Electric force.
• Magnetic force.
• Nuclear force.
• Frictional force.