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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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Force and Momentum + Problems 9th Physics chapter 3

 Force And Momentum

Force:

            Force is an agent which produce distortion in the body.
        Force is a Vector Quantity.
Force And Momentum

Unit of Force:

                    The unit of force is newton .
                    It is denoted by N.
Newton: Newton is  the force required to produce 1m/s^2 acceleration in boy of mass 1kg.
Unit of Force

Momentum:

                    The momentum is the product of mass and velocity.
                    Mathematically, it can be written as,
                                p=mv
p => Momentum
m=> Mass
v=>Velocity
                Momentum is a vector quantity.
                Momentum is the relationship between mass and velocity of the body.
                Greater the mass less will be velocity of the object.
Force and Momentum

For Example: You are asked to stop two objects one is a bicycle and another is a truck. Which will be easy to stop?
Off course it is easy to stop a bicycle because it has small mass and thus possess less momentum. On the other hand truck has greater mass and that's why it possess more momentum and hence it is hard to stop it.

Unit of Momentum:
            Considering formula again,
                            p=mv
p is the momentum
m is the mass and its unit is kilogram (kg).
v is the velocity of the object and its unit is m/s.
so, the unit of momentum is kgm/s.

EXAMPLES PROBLEMS ON MOMENTUM

Example problems on momentum

Numerical problems on momentum
PowerPoint Presentation of this lecture:
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