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Understanding Hooke's Law: The Foundation of Elasticity| Chapter 5 Physics 9th

HOOKE'S LAW   Introduction In physics, Hooke's Law is one of the fundamental principles governing how objects deform under external forces . Named after the 17th-century British physicist Robert Hooke, this law provides a crucial understanding of the behavior of elastic materials, such as springs and rubber bands. Whether stretching a rubber band or compressing a spring, Hooke's Law helps explain what happens when forces act on these materials. What is Hooke's Law: Hooke's Law states that the force F needed to extend or compress a spring by some distance x is proportional to that distance. Mathematically, it is expressed as: F= -kx Here k represents the spring constant, which is the measure of the stiffness of the spring, and x is the displacement from the displacement position.  The negative sign indicates that the force exerted by the spring is in the opposite direction of the displacement.  Understanding the Spring Constant: The spring constant k is a critical co...
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Like and Unlike Parallel forces | Chapter 4 Turning effect of forces | Physics 9th

Chapter 4 Turning Effects of Forces     Like and Unlike Parallel Forces:  
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Chapter 3 Dynamics Solved Exercises Section B

 DYNAMICS- SOLVED EXERCISES  SECTION B
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Chapter 3 Dynamics Exercises Solutions Section A MCQS

 CHAPTER 3 DYNAMICS SECTION A: MULTIPLE CHOICE QUESTIONS
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Friction its advantages and disadvantages | Methods of reducing friction

 Friction Before discussing what is Friction? Lets consider a scenario, suppose you are continuously paddling a bicycle, but when you stop paddling the cycles got stopped after covering some distance. Do you know why is that so? Naturally there must be some force that stops the moving objects. The Force not only helps the objects to move it also stops the moving objects. On the other hand, suppose you kick a ball after covering a distance it got stopped. Why it got stopped? In both the cases two forces acting on both the bodies parallelly. One is Normal force (R) which is applied by you to move the object, and another is limiting force (Fs) which acts in opposite direction to stop the moving object. As we can observe in above figure, when a car is moving there are two forces acting on it.  1. R which is Normal Force applied by engine of the car. 2. Fs which is Limiting force it is frictional force which is opposing the normal force. Definition of Friction:     ...
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Centripetal Force and Centripetal Acceleration

 Centripetal Force A force that compels a body to move in the circular path is termed as Centripetal Force.  It is denoted by Fc. Derivation: Centripetal Force is directly proportional to the mass of the moving body. Centripetal force is directly proportional to the square of the velocity. Centripetal force is inversly proportional to the  radius of the circular path. Centripetal Acceleration The acceleration produced due to the centripetal force is known as Centripetal Acceleration.  It is denoted by ac. Derivation:            
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Difference Between Mass and Weight | Physics 9th

 DIFFERENCE BETWEEN MASS AND WEIGHT
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Laws Of Motion Physics

 NEWTON'S   LAWS OF MOTION NEWTON'S FIRST LAW OF MOTION: You have often observed the table placed in your classroom . It always remains at the same place until you apply some force to move it. Like a book placed on the table remains at its place unless someone picks it back. Similarly, a satellite in the space continuously moves with constant speed because there is no air or force of friction in the space. Contrary to above examples, a ball rolling on the ground however stops after some time because friction of ground and air resistance exert force on it and change its state of motion or direction of motion. We can define Newton’s first law of motion as,                      "A body continues its state of rest or of uniform motion in a straight line unless an external force acts on it ". Newton's First law is also known as Law of Inertia. Inertia can be defined as,      ...
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