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Linear momentum is a vector quantity defined as the product of an object's mass, m, and its velocity, v. Linear momentum is denoted by the letter p and is called “momentum” . The body's momentum is always in the same direction as its velocity vector.p=mv
SI unit: kilogram meter per second kg⋅m/s
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Friction is the force resisting the relative motion of solid surfaces, fluid layers, and material elements sliding against each other.
Friction is the resistance to motion of one object moving against another. Friction is what causes fire to start when you rub two sticks together.
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{tex}\eqalign{ & PE = 0 \cr & PE = {1 \over 2}k{x^2} \cr} {/tex}
Potential energy stored in spring is as a result of deformation of an elastic object, such as the stretching of a spring. It is equal to the work done to stretch the spring, which depends upon the spring constant k as well as the distance stretched.Potential energy is zero for unstretched spring.
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Instantaneous velocity is defined as the rate of change of position for a time interval which is very small (almost zero). We know that the average velocity for a given time interval is total displacement divided by total time.It is vector quantity.
Velocity (v) = ds/dt
Instantaneous Speed : the average speed is for a given time interval is total distance travelled divided by the total time taken, we can also say that instantaneous speed at any given time is the magnitude of instantaneous velocity at that time.It is scalar quantity.
Speed(s) = ds/dt
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