![]() 1. Define : gravitation, gravity and gravitational force. 2. State the universal law of gravitation and its mathematical form. 3. In what source is ‘G’ universal? 4. What happens to the force of attraction between two objects when (i) Their mass are halved? (ii) Distance between them is increased to 4 times its previous value. (iii) Distance between them as well as each of the mass is increase to 4 times. 5. If the distance between two bodies is increased 4 times by what factor should the mass of the bodies be altered so that the gravitational force between them remains the same? 6. What is the force between two spheres weighing 20 kg each... Read more » Class IX Science SA-1 Quick Links
IX Motion and rest IX Force and Law of motion IX Gravitation IX Matter in our surrounding IX Is matter around us pure IX Biology Term-1
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Q. When a carpet is beaten with a stick, dust comes out of it. Explain.
Ans. Initially, the carpet and loose dust particles in it are at rest. But when the carpet is hit with a stick, it is suddenly be into motion, but the dust particles in it try to remain in the state of rest because of inertia of rest. And dust comes out of the carpet. Q. Why is it advisable to tie luggage kept on the roof of a bus with rope ? Ans. When the luggage is not tied with a rope to the bus, then due to inertia of rest, it will move back when the bus starts moving and will move forward due to inertia of motion when the bus stops. Thus it may fall down So it is advisable to tie the luggage kept on the roof of a bus with rope. First law of motion: Newton’s First law explains the “natural” motion of an object when it is left free. The law says that- Every object continues in its state of rest, or of uniform motion in a straight line with unchanging speed, unless compelled to do otherwise by forces acting upon it.So, naturally an object at rest will remain at rest and an object moving with a constant speed in a straight line will keep moving, unless they are disturbed by a force.This property of matter to continue its state of rest or of uniform motion is called “Inertia”. Hence, this law is also called the Law of Inertia. Second law of motion: Newton’s 2nd law of motion relates the external force (F) acting on a body with the mass (m) of the body; and is mathematically written as F = ma, ‘a’ is the acceleration of the body due to the force. It states that the acceleration of a body due to net external force acting on it is equal to the net force divided by the mass of the body.The difficulty you face while pushing or pulling a heavier box compared to a lighter box is explained by the 2nd law of motion. Third law of motion: This law deals with the forces between bodies that appear in pairs. It says that every action has an equal and opposite reaction. When you stand on the ground, your weight pushes the ground downwards; does this make the ground to move downward? No, because the ground pushes you upward with a force equal to your weight and hence these equal and opposite forces cancel out and you stand on the ground balanced. Force by you on the ground and force on you by the ground are two equal and opposite forces acting in pairs at the surface that is common to both you and the ground. Related post you may also like: IX Force and laws of motion solved questions NCERT solution Force and Law of motion for class 9 Guess Questions 2012 Ch-9 FORCE AND LAWS OF MOTION QUESTION BANK Class 9th Physics (Forces and Laws of motion) 9th Forces and Laws of motion teat paper-1 9th force and law of motion Test paper -2 9th Forces and Laws of motion teat papers unsolved CBSE PHYSICS Force and law of motion Numerical for class9 unsolved Solved Numerical Problems in 9th Force and Laws of motion Q. Why evaporation is called surface phenomenon? Ans : As evaporation occur on the surface of liquid. Q. List two processes from which it may be concluded that the particles of a gas move continuously. Ans: Compressibility and Brownian movement Q. At what temperature does solid ice and liquid water co-exist together? Ans: At 00C, the three phases of water co exist called triple point. Q. What is common among the three states of matter? Ans: They all contain molecules. Q. . Which property of gas is used in supplying oxygen cylinders to hospitals? Ans: Compressibility Q. a substance x was highly compressible and could easily be liquefied. it could also take the shape of the container. Predict the nature of the substance Ans: Gas Q. What is the state of water at 100 degree celsius, zero degree celsius and 4 degree celsius? Ans: The state of water in 100 degree celcius is gas, in 0 degree celcius it is solid and in 4 degree celcius it is liquid Q. can a liquid turn into vapor without heating? Ans: yes, By the process of evaporation as vaporization of water occur below the boiling point under atmospheric pressure. Q. What do you mean by Latent heat of Fusion? Ans: the heat required to change 1 kg of a solid substance into liquid state at the melting point of the substance. For example, amount of heat required to melt ice at 0 ° C into water, at 0 ° C will be known as the Latent Heat of Fusion of ice. Q. What is compressibility? How it is negligible in solids? Ans: Compressibility is the ability of a substance to be reduced to its volume under pressure. Solids are incompressible as their particles are held together. So, we can tell that compressibility is negligible in solids. Q. Two cubes of ice are pressed hard between two palms. After releasing the pressure, the cubes join together. Why? Ans: Pressure is directly proportional to temperature when we apply pressure, temp. Increases then the ice in contact melts and it turns into water. when pressure is removed, the temperature decreases again and melted ice again freezes .Hence cubes join together. Q. Explain why ice has lower density than water? Ans: The mass per unit volume of a substance is called density (density = mass/volume). As the volume of a substance increases, its density decreases. When water changes into ice, space between particles increases. These spaces are larger as compared to the spaces present between the particles of water. Thus, the volume of ice is become greater than that of water. Hence, the density of ice became lower than that of water. As, a substance with lower density than water can float on water. Therefore, ice floats on water. Chapter : Matter In Our Surroundings
Module : 01 Contents: 1. Definition of matter 2. Physical nature of matter (i) Matter is made up of particles (ii) The particles of matter are very small 3. Characteristics of particles of matter (i) Particles of matter have spaces between them (ii) Particles are continuously moving. (iii) Particles attract each other Learning Objectives After studying the contents the students will be able to understand 1. What is matter? 2. What are the characteristics of the particles of matter? 3. What is diffusion? Key Terms: 1. Diffusion 2. Matter Activity Students are shown diffusion of potassium permanganate and copper sulphate crystals in water. Module : 02 Chapter : Matter In Our Surroundings Contents : 1. Three states of matter and their examples. 2. Properties of solids, liquids and gases. 3. Differences between solids, liquids and gases. Module :03 Chapter : Matter In Our Surroundings 2. Interchangeability between the three states of matter. 3. Effect of change of temperature and pressure. (i) Boiling and melting point of a substance of matter. (ii) Latent heat of fusion. (iii) Sublimation Learning Objectives After the Completion of the content the students will be able to understand. 1. How are the molecules arranged in different states of matter? 2. How can the different states of matter be interchanged? 3. What are the differences between the three states of matter? Key Terms: 1. Latent heat of fusion is the amount of heat energy required to change 1 kg of solid into liquid at its melting point. 2. Latent heat of vaporization is the heat energy required to change 1 kg of liquid to gas at atmospheric pressure at its boiling point. 3. What is the effect of change of pressure on the various states of matter? 4. How does the temperature bring about the inter changeability between the three states of matter? Activity: Students are shown the sublimation of ammonium chloride. Practical No. 1 To determine the melting point of ice and the boiling point of water. Module : 04 & 05 Chapter : Matter In Our Surroundings Contents : 1. Conversion of Celsius scale to Kelvin scale and Vice versa. 2. Evaporation (i) Its definition and cause. (ii) Factors affecting evaporation. (iii) How does evaporation cause cooling? (iv) Difference between evaporation and boiling. Learning Objectives After the Completion of the content the students will be able to 1. Define evaporation 2. What are the various factors affecting evaporation. Key Terms: Students are given numericals on the conversions of temperature in Kelvin scale to celsius scale and vice versa. Matter in Our Surroundings extra scoring study material free IX Matter in Our Surroundings Notes IX Matter in Our Surroundings MCQ IX Matter in Our Surroundings [Solved] Visit to Download Files ![]() SCALARS & VECTORS Physical quantities which can completely be specified by a number (magnitude) having an appropriate unit are known as "SCALAR QUANTITIES". Scalar quantities do not need direction for their description. Example: Work, energy, electric flux, volume, refractive index, time, speed, electric potential, potential difference, viscosity, density, power, mass, distance, temperature, electric charge, electric flux etc Physical quantities having both magnitude and direction with appropriate unit are known as "VECTOR QUANTITIES". We can't specify a vector quantity without mention of direction. Velocity, electric field intensity, acceleration, force, momentum, torque, displacement, electric current, weight, angular momentum etc. "Kinematics is the branch of Physics in which we discuss bodies at rest or motion without the reference of external agent that causes motion or rest." OR , "The branch of physics which deals with the description of motion of objects without reference to the force or agent causing motion in it, is called Kinematics." "If a body does not change its position with respect to its surroundings then the body is said to be in a state of rest." "If a body continuously changes its position with respect to its surrounding than it is said to be in a state of motion." Motion of objects can be divided into three categories. (i) TRANSLATIONAL MOTION (ii) ROTATIONAL MOTION (iii) VIBRATIONAL MOTION "Motion of a body in which every particle of the body is being displaced by the same amount is called Translational Motion". EXAMPLE: (i) Motion of a person on a road. (ii) Motion of a car or truck on a road. "Type of motion in which a body rotates around a fixed point or axis is called Rotational Motion." EXAMPLE: (i) Motion of wheel (ii) Motion of the blades of a fan "Type of motion in which a body or particle moves to and fro about a fixed point or mean position is called Vibratory Motion." EXAMPLE: (i) Motion of simple pendulum (ii) Motion of the wires of guitar (iii) Motion of swing ![]() Module : 9P (01 & 02) Chapter: Motion Click Here Contents: 1. Motion in Living and Non-Living things. 2. Uniform and Non-Uniform Motion. 3. Distance Traversed and Displacement 4. Scalar and Vector Quantities. 5. Speed and velocity Learning Objectives The students will: 1. Understand and distinguish between Rest and Motion 2. Understand Scalar and Vector quantities. 3. Differentiate between Uniform and Non-Uniform motion. 4. Understand and explain the meaning of Average Speed. Key Term Scalars and Vectors, Distance and Displacement, Average Speed, Velocity, Average Velocity Module: 03 & 04 Chapter: Motion Contents: 1. Velocity and Acceleration 2. Graphs: Distance – Time Displacement – Time Speed – Time Velocity – Time Learning Objectives The students will: 1. Understand the concept of Acceleration. 2. Understand the importance of graphs. 3. Learn how to plot graphs. 4. Compute Speed and Acceleration from graphs. Key Term 1. Acceleration 2. Retardation 3. Area under the graph 4. Slope of graph Module : 05 Chapter : Motion Contents : 1. Derivation of three Equation of Motion (By numerical as well as by graphical method) 2. Numerical based on Equations of Motion 3. Circular Motion (qualitative idea) Learning Objectives The students will: 1. Understand the relation between Acceleration, Velocity and Time. 2. Derive the three Equations of Motion. 3. Solve numericals. 4. Explain Circular Motion and identify it as an accelerated motion. Key Terms 1. Angular displacement 2. Angular velocity IX Physics Motion and Rest Notes
Download File IX Physics Motion and Rest numerical Unsolved Download File IX Physics Motion and Rest solved Numerical Download File IX Physics Motion and Rest Test paper-1 Download File Assignment_2012-2013 science 9th chemistry Download File Assignment_2012-2013 science 9th Physics Download File |
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