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## Answers

*Linear momentum is a measure of an object's translational motion. The linear momentum p of an object is defined as the product of the object's mass m times its velocity v.*

*p = mv.*

*Linear momentum is a vector. Its direction is the direction of the velocity. The Cartesian components of p are*

*px = mvx, py = mvy, pz = mvz.*

*If an object's velocity is changing, its linear momentum is changing. We have*

*dp/dt = d(mv)/dt.*

*If the mass of the object is constant then*

*dp/dt = mdv/dt = ma.*

*We write*

*dp/dt = F.*

*This is a more general statement of Newton's second law which also holds for objects whose mass is not constant.*

*If an object receives an impulse, its momentum changes. We may write*

*dp = Fdt.*

*Therefore*

*.*

*If the force acting on the object is constant, then*

*∆p = F∆t.*

*The integral of force over time is called the impulse I of the force. We have shown that the impulse I is equal to the change in momentum ∆p. You give an object an impulse, by letting a force act on it for a time interval ∆t.*

*I = ∆p = Favg∆t*

Hope this may helps uu..................