Tag: class 9
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Class 9th – WORK
Work is defined as the force acting upon an object that causes an object to move. It is defined as the product of the magnitude of force and the displacement due to force. W=F x s Here, W= work done on an object F = Force on the object s = Displacement of the object Work done depends upon 2 factors…
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Class 9th – Gravitation – THRUST & PRESSURE
THRUST The force that is applied on a surface that is perpendicular to the surface is called THRUST. Thus thrust is a perpendicular force. Its SI Unit is N (Newton) Thrust is in opposite direction to gravity. PRESSURE Thrust on unit area is called Pressure. When Force F is applied on a Surface Area A…
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Class 9th – Gravitation – MASS & WEIGHT
According to Galileo, Two bodies of different masses dropped from the same height will touch the floor at the same in the absence of air resistance. For example, if we drop two objects of masses 5kg and 8kg from same height then both the object will reach at the surface of earth at same…
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Class 9th – Gravitation – Variation of g
We know that the earth is not spherical in shape; the earth is flat from the pole side and bulging from the equator making the shape of geoid. Thus earth is geoid in shape. When we talk about poles, it can be clearly depicted from the diagram that the radius at the poles will be…
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Class 9th – Gravitation – FREE FALL
FREE FALL Whenever objects fall on the earth which is due to gravitational pull and this gravitational pull of earth which makes object fall towards it under this force alone is called as FREE FALL. When the object fall towards the earth, there will be no change in the direction of motion but as the…
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Class 9th – GRAVITATION
Earth attracts every object towards it by a force. This force is called force of gravitation or gravitational pull. This gravitational pull is also called as fore of attraction, as it attracts things towards earth. An object falls on the earth and this is due to force of Gravity or Gravitational pull. Example: When you…
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Class 9th – Nervous tissue
The nervous tissue comprises of brain, spinal cord and nerves. Structural and functional unit of nervous system is NEURON. Cells of nervous tissue are highly specialized for stimulation. It is responsible for coordinating and controlling. NEURONS A neuron consists of cell body, nucleus within the cell body and cytoplasm. The long part of neuron is…
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Class 9th – MUSCULAR TISSUE
Muscular tissue consists of elongated cells which are called MUSCLE FIBRES. Muscles contain special Protein called contractile proteins. The contractile proteins are Actin and Myosin. The role of contractile protein is contraction and relaxation and thus helps in Movement. STRIATED MUSCLES They are voluntary in nature. I.e. they move according to our will. So also…
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Class 9th – Connective Tissue – Bone
BONE Bone is a connective tissue. It forms the framework that supports the whole body. It also anchors the different muscles and supports all the main organs of the body. It is a strong and non-flexible tissue. Matrix: hard matrix and is composed of calcium and phosphorus compounds. It consists of Tendon Ligament Cartilage…
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Class – 9th : Connective Tissue – Blood
FLUID MATRIX: PLASMA FUNCTIONS OF BLOOD: Blood flows and transports: Gases Digested food Hormones Waste materials to different parts of the body. Blood carries oxygen as oxyhaemoglobin with the help of RBC.