# 9th Class Physics Chapter 2 Important Short Questions 2024

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## 9th Class Physics Chapter 2 Short Questions

• A body is said to be at rest if it does not change its position with respect to its surroundings.
• A body is said to be in motion if it changes its position with respect to its surroundings.
• Rest and motion are always relative. There is no such thing as absolute rest or absolute motion.
• Motion can be divided into the following three types.
• Translatory motion: In which a body moves without any rotation.
• Rotatory motion: In which a body spins about its axis.
• Vibratory motion: In which a body moves to and fro about its mean position.
• Physical quantities which are completely described by their magnitude only are known as scalars.
• Physical quantities which are described by their magnitude and direction are called vectors.
• Position means the location of a certain place or object from a reference point.
• The shortest distance between two points is called the displacement.
• The distance traveled in any direction by a body in a unit of time is called speed.
• If the speed of a body does not change with time then its speed is uniform.
• The average speed of a body is the ratio of the total distance covered to the total time taken.
• We define velocity as the rate of change of displacement or speed in a specific direction.
• The average velocity of a body is defined as the ratio of its net displacement to the total time.
• If a body covers equal displacements in equal intervals of time, however small the interval may be, then its velocity is said to be uniform.
• The rate of change of velocity of a body is called acceleration.
• A body has uniform acceleration if it has equal changes in its velocity in equal intervals of time, however small the interval may be.
• Graph is a pictorial way of describing information as to how various quantities are related to each other.
• The slope of the distance-time graph gives the speed of the body.
• Distance-time graphs provide useful information about the motion of an object.
• The slope of the displacement-time graph gives the velocity of the body.
• Distance covered by a body is equal to area under speed – time graph.
• The speed-time graph is also useful for studying motion along a straight line.
• The distance traveled by a body can also be found from the area under a velocity-time graph if the motion is along a straight line.
• When a body is dropped freely it falls down with an acceleration towards Earth. This acceleration is called acceleration due to gravity and is denoted by g. The numerical value of 2 g is approximately 10 ms near the surface of the Earth.