March 2, 2016 Grade 9, Gravitation, Physics

Center of Gravity: The center of gravity is the average location of the weight of an object. Completely describe the motion of any object through space in terms of the translation of the center of gravity of the object from one place to another, and the rotation of the object about its center of gravity if it is free to rotate.To […]

March 2, 2016 Grade 9, Gravitation, Physics

Gravitational Force Between Two Bodies: Newton’s law of gravity states that the gravitational force between two bodies is proportional to the product of their masses and inversely proportional to the square of the distance between them.To know more about Gravitational Force Between Two Bodies,watch Gravitational Force Between Two Bodies Video to learn more . The Universal Gravitation Equation is: F = GMm/R2 where F is the force of attraction between two objects in newtons (N) G is the Universal Gravitational Constant = 6.674*10−11 N-m2/kg2 M and m are […]

March 2, 2016 Grade 9, Gravitation, Physics

Newtons Universal Law of Gravitation The principle that two bodies exert a gravitational attraction for each other that increases as their masses increase and as the distance between them decreases. In mathematical terms, the force equals the product of the two masses multiplied by the gravitational constant and divided by the square of the distance. Also called law of gravitation, law of universal gravitation.To know more about Newtons Universal Law of Gravitation,watch Newtons Universal Law of Gravitation Video to learn more . Idea: Newton’s Universal Law of Gravitation States that any two objects exert a gravitational force of attraction on each other. The direction of the force is along the […]

March 2, 2016 Grade 9, Gravitation, Physics

Motion of Particles Under Gravity in Vacuum An object that falls through a vacuum is subjected to only one external force, the gravitational force, expressed as the weight of the object. The weight equation defines the weight W to be equal to the mass of the object m times the gravitational acceleration g.To know more about Motion of Particles Under Gravity in Vacuum,watch Motion of Particles Under […]

March 2, 2016 Grade 9, Gravitation, Physics

Mass and Weight: Weight is the force on an object due to gravity, so this is how much the Earth is pulling you toward it. The more you weigh, same amount of ‘stuff’ on the moon as it does on Earth. This measurement is your mass, the amount of matter in an object.To know more about Mass and […]

February 27, 2016 Grade 9, Physics, Wave Motion and Sound

Simple harmonic waves: A motion which repeats itself after a definite interval of time is called periodic motion. The time interval after which the motion repeats is called the time period.To know more about Simple Harmonic Waves , watch Simple Harmonic Waves Video to learn more . Circular motion: Circular motion is one example of […]

Scalar and vector quantities: A scalar quantity is a one dimensional measurement of a quantity, like temperature, or weight. A vector has more than one number associated with it. A simple example is velocity. It has a magnitude, called speed,To know more about Scalar and vector quantities Video,watch Scalar and vector quantities Video to learn more . Scalars and Vectors: Scalars have magnitude only. […]

Speed Video : The rate of change in distance with respect to time. Since speed is built from distance, a scalar quantity, then speed is also a scalar quantity. This means it carries no direction information with it.To know more about Speed ,watch Speed Video to learn more . Speed: Nearly everyone knows that […]

February 25, 2016 Grade 9, Gravitation, Physics

Introduction About Weightlessness: Being without apparent weight, as a freely falling body or a body acted upon by a force that neutralizes gravitation.The phenomenon of “weightlessness” occurs when there is no force of support on your body. When your body is effectively in “free fall”, accelerating downward at the acceleration of gravity, then you are […]

February 25, 2016 Grade 9, Gravitation, Physics

Introduction About Value For Acceleration Due to Gravity on Earth: The acceleration of a falling body in the earth’s gravitational field, inversely proportional to the square of the distance from the body to the center of the earth, and varying somewhat with latitude: approximately 32 feet (9.8 meters) per second per second. Symbol: g. Also […]

February 25, 2016 Grade 9, Gravitation, Physics

Introduction About Universal Gravitational Constant: The constant relating the force of gravitational attraction between two bodies to the product of their masses and the inverse square ofthe distance between them in Newton’s law of gravitation. It equals 6.67 × 10-11 m3kg-1s-2.watch Introduction About Universal Gravitational Constant to learn more. Universal Gravitational Constant: The gravitational constant, symbolized G , is a physical constant that appears in the equation for Newton’s law of gravitation. Sir Isaac Newton (1642-1727), the English mathematician, quantified the behavior of the force of gravity . He noticed that the gravitational force between […]

February 25, 2016 Grade 9, Gravitation, Physics

Introduction About Units of Thrust: Area A = F / p (force divided by pressure) Definition: Kilogram. The kilogram or kilogramme, (symbol: kg) is the SI base unit of mass. A gram is defined as one thousandth of a kilogram.watch Introduction About Units of Thrust to learn more. Units of Thrust: The beginning of this chapter, we have defined the force as an […]

February 25, 2016 Grade 9, Gravitation, Physics

Introduction about Units of Pressure: Unites of Pressure pressure p in pascals exists on an object or region whose surface area is A meters squared, then the force F, in newtons, required to produce p is given by the following formula:watch Introduction about Units of Pressure to learn more. F = pA Units of Pressure: They move rapidly and randomly, they don’t interact with each […]

February 25, 2016 Grade 9, Gravitation, Physics

Unit of Weight: Unit of Weight – the force at which earth or any other gravity generating astral body attracts objects, it’s a vector value. In common use weight is often confused with mass. Weight: Weight is the gravitational force acting on a body mass. The generic expression of Newton’s Second Law (1) can be transformed to express weight as a […]

February 25, 2016 Grade 9, Gravitation, Physics

Thrust and Pressure: Pressure :- Force exerted by any object per unit area is called pressure. Thrust. The upward force exerted on a body by the fluid in which the body is submerged is called the upthrust or buoyant force. The property of liquid to exert an upward force on a body immersed in it is called buoyancy.watch […]

February 25, 2016 Grade 9, Gravitation, Physics

Introduction About Value of g: Mass is a measure of how much matter an object contains, while weight is a measure of the force of gravity on the object. An object has the same composition, and therefore mass, regardless of its location.watch Introduction About Value of g to learn more. The Weight of the Body Depends on the Value […]

February 25, 2016 Grade 9, Gravitation, Physics

Center of Gravity Depends on Shape: Is a unique location in space that is the average position of the system’s mass. This place is called the center of mass,After developing kinematics of rotational motion, the rotational motion dynamics were developed. In this the parallel concepts are applied to linear dynamics which contains some unique concepts […]

February 25, 2016 Grade 9, Gravitation, Physics

Role of Pressure in Daily Life Video: Pressure is the ratio of force to the surface area over which it is exerted. Though solids exert pressure, the most interesting examples of pressure involve fluids—that is, gases and liquids—and in particular water and air. Pressure plays a number of important roles in daily life, among them its function in the […]

February 25, 2016 Grade 9, Gravitation, Physics

Introduction About Proof of Archimedes Principle: Buoyant force is the force applied upward on an object by any fluid. Archimedes’ principle states that the buoyant force applied to an object is equal to the weight of the fluid the object displaces.watch Introduction About Proof of Archimedes Principle to learn more. Proof of Archimedes Principle: The fluid is the states […]

February 25, 2016 Grade 9, Gravitation, Physics

Introduction About Newtons Inverse Square: The principle in physics that the effect of certain forces on an object varies by the inverse square of the distance between the object and the source of the force. The magnitude of light, sound, and gravity obey this law, as do other quantities.watch Introduction About Newtons Inverse Square to learn more. Newtons […]

February 25, 2016 Grade 9, Gravitation, Physics

Motion of a Projectile: Projectile motion is motion under the influence of gravity. If we stand at the edge of the roof of the Science Building and throw a ball up at an angle, it moves up and then down vertically while it moves horizontally.This is projectile motion.Watch Motion of a Projectile to learn more. To better understand […]

February 25, 2016 Grade 9, Gravitation, Physics

Measurement of Weight: Physics. the force that gravitation exerts upon a body, equal to the (watch Measurement of Weight to learn more)mass of the body times the local acceleration of gravity: commonly taken, in a region of constant gravitational acceleration, as a measure of mass. A ideal spring has an equilibrium length. If a spring is compressed, then a force with magnitude proportional to thedecrease in length from the equilibrium length is pushing each end away from the other. If a spring is stretched, then a force with magnitude proportional […]

February 25, 2016 Grade 9, Gravitation, Physics

Introduction About Mass and Weight Video Weight is the force on an object due to gravity, so this is how much the Earth is pulling you toward it. The more you weigh, same amount of ‘stuff’ on the moon as it does on Earth. This measurement is your mass, the amount of matter in an object. Mass and […]

February 25, 2016 Grade 9, Gravitation, Physics

Keplers laws of planetary motion Kepler’s efforts to explain the underlying reasons for such motions are no longer accepted; nonetheless, the actual laws themselves are still considered an accurate description of the motion of any planet and any satellite.watch Keplers laws of planetary motion to learn more. Kepler’s three laws of planetary motion can be […]