February 5, 2016 Grade 9, Gravitation, Physics

Introduction About Geotropism Video: The growth of the parts of plants in response to the force of gravity. The upward growth of plant shoots is an instance of negative geotropism ; the downward growth of roots is positive geotropism.watch Introduction About Geotropism Video to learn more. Geotropism: The roots are exhibiting positive geotropism, or growth with gravity, while the stem […]

February 5, 2016 Grade 9, Gravitation, Physics

Introduction About Force of Gravitation: A force that exists among all material objects in the universe. For any two objects or particles having nonzero mass , the force of gravity tends to attract them toward each other. Gravity operates on objects of all sizes, from subatomic particles to clusters of galaxies. It also operates over all distances, […]

February 5, 2016 Grade 9, Gravitation, Physics

Introduction About Fluid Pressure: The pressure exerted by a fluid at any point inside it. The difference of pressure between two levels is determined by the product of the difference of height, the density, and the acceleration of free fall.watch Introduction About Fluid Pressure to learn more. Fluid Pressure: Pressure is a measurement of the force per unit area. Fluid pressure can […]

February 5, 2016 Grade 9, Gravitation, Physics

Distinction Between Mass and Weight : The difference between mass and weight is that mass is the amount of matter in a material and weight is a measure of how the force of gravity acts upon that mass.watch Distinction Between Mass and Weight to learn more. Mass is the measure of the amount of matter in a body. Mass is denoted using […]

February 5, 2016 Grade 9, Gravitation, Physics

Introduction About Center of Mass The center of mass is the point at which all the mass can be considered to be “concentrated” for the purpose of calculating the “first moment”, i.e., mass times distance. For two masses this distance is calculated from. Center of Mass Mass is the amount of matter an object has. Every part of an object forms […]

February 5, 2016 Grade 9, Gravitation, Physics

Introduction About Buoyancy Video: The force that causes objects to float. According to the principle of Archimedes, when a solid is placed in a fluid (a liquid or a gas ), it is subject to an upward force equal in magnitude to the weight of the fluid it has displaced.watch Introduction About Buoyancy Video to learn more. Buoyancy: Buoyancy arises from the fact that fluid pressure increases with depth and from the fact that the increased pressure is exerted in all directions (Pascal’s principle) so that there is an unbalanced upward force on the bottom of a submerged object.Since […]

February 5, 2016 Grade 9, Gravitation, Physics

Introduction About Archimedes Principle: A law stating that a body totally or partially immersed in a fluid is subject to an upward force equal in magnitude to the weight of fluid it displaces.watch Introduction About Archimedes Principle to learn more. Archimedes Principle: The fluid is the states of matter. These are classified in two types that […]

February 5, 2016 Grade 9, Gravitation, Physics

Applications 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 Applications of Archimedes Principle to learn more. Submarine: A submarine has a large ballast tank, which is used to […]

February 5, 2016 Grade 9, Gravitation, Physics

Introduction About Acceleration Due to Gravity: Acceleration of gravity. The acceleration of a body falling freely under the influence of the Earth’s gravitational pull at sea level. It is approximately equal to 9.806 m (32.16 ft) per second per second, though its measured value varies slightly with latitude and longitude. Also called acceleration of free […]

February 5, 2016 Grade 9, Gravitation, Physics

Acceleration Due to Gravity and its Variation: Bodies allowed to fall freely were found to fall at the same rate irrespective of their masses (air resistance being negligible). The velocity of a freely falling body increased at a steady rate i.e., the body had acceleration. This acceleration is called acceleration due to gravity – ‘g’.watch […]

February 5, 2016 Force and Laws of motion, Grade 9, Physics

Introduction About Type of Friction: Frictional force is an important force in day to day life. For example, it would be impossible to walk on the floor without friction. One would not be able to hold onto a glass, write with a pen or do even the simplest kind of work for that matter.watch Introduction About Type […]

February 5, 2016 Force and Laws of motion, Grade 9, Physics

Introduction About Newtons Third Low of Motion: Newton’s third law is: For every action, there is an equal and opposite reaction. The statement means that in every interaction, there is a pair of forces acting on the two interacting objects. The size of the forces on the first object equals the size of the force on […]

February 5, 2016 Force and Laws of motion, Grade 9, Physics

Newtons Second Law of Motion: Newton’s second law of motion can be formally stated as follows: The acceleration of an object as produced by a net force is directly proportional to the magnitude of the net force, in the same direction as the net force, and inversely proportional to the mass of the object.watch Newtons second […]

February 5, 2016 Force and Laws of motion, Grade 9, Physics

Introduction About Newtons First Law of Motion: The focus of Newton’s first law of motion – sometimes referred to as the law of inertia. 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.watch Newtons First Law of Motion Video […]

February 5, 2016 Force and Laws of motion, Grade 9, Physics

Introduction About Momentum Video : The impetus of a moving object .strength or force that keeps growing or building: a campaign that gained momentum the product of the mass of a particle, body, etc. and its velocity: abbrev. watch Introduction About Momentum Video to learn more. Momentum: Momentum is a commonly used term in sports. A team that has the […]

February 5, 2016 Force and Laws of motion, Grade 9, Physics

Law of Conservation of Momentum: The law of conservation of momentum states that the total momentum of a closed system does not change.This means that when two objects collide the total momentum of the objects before the collision is the same as the total momentum of the objects after the collision. Momentum: Quantity of motion […]

February 5, 2016 Force and Laws of motion, Grade 9, Physics

Introduction About Inertia and Mass : The mass of a body as determined by the second law of motion from the acceleration of the body when it is subjected to a force that is not due to gravity. 2. the measure of the property of inertia. Compare Eötvös experiment, inertia (def 2a), gravitational mass.watch Introduction About Inertia and Mass to learn more. […]

February 5, 2016 Force and Laws of motion, Grade 9, Physics

Impulsive Force: F = applied force (N, lbf) dM = change of momentum (kg m/s, lb ft/s) dt = time taken (s)Forces that act for a very short time are calledimpulsive forces. The product of theimpulsive force and the time it acts is called the impulse. Impulse and impulsive Force 1. Impulse is defined as the change momentum 2. From, […]

February 5, 2016 Force and Laws of motion, Grade 9, Physics

Introduction About Friction Videos : To stop a moving object, a force must act in the opposite direction to the direction of motion. For instance, if you push your book across your desk, the book will move. The force of the push moves the book. As the book slides across the desk, it slows down […]

February 5, 2016 Force and Laws of motion, Grade 9, Physics

Introduction About Force : A force is a push or pull on an object. This push or pull comes from the objects interacting with one another and only from such interactions. Once the interaction stops, there is no longer any force.watch Definition of Force to learn more.. Definitions for Force: 1) Force is a push or pull 2) […]

February 5, 2016 Force and Laws of motion, Grade 9, Physics

Advantages Disadvantages of Friction: Friction helps us to walk.When we press the ground with our foot backward,we receive a forward reaction due to friction between our foot and the ground.Had there been no friction the foot will simply slip away. friction hepls ue to write on the backboard or on a paper. Brakes make use of friction […]

Graphs and Their Uses: A diagram representing a system of connections or interrelations among two or more things by a number of distinctive dots, lines, bars,etc.watch Graphs and Their Uses to learn more. Types of Graphs Pie Graph A pie graph, also known as a pie chart, is a type of graph commonly used in conjunction […]

Introduction About Velocity Video: The speed of a moving object in particular direction is called velocity. Velocity has both magnitude and direction while speed has only magnitude and no direction.watch Introduction About Velocity Video to learn more. Velocity of an object is the distance covered in particular direction in unit time. Velocity: Velocity is a vector expression of […]

Uniform Motion and Non Uniform Motion: Uniform Motion:- A body is said to have a uniform motion if it travels equal distances in equal intervals of time, no matter how small these intervals may be.A distance-Time graph for uniform motion is a straight line. Non-Uniform Motion:- A body is said to have a non- uniform motion […]