Chapter 4 Circular Motion
centripetal force - The net force required to keep an object moving in a circular path. This force is directed toward the center of the circular path. For uniform circular motion, the centripetal force has a magnitude mv2/r.

Centripetal acceleration= Velocity Squared/ radius (A=V2/R)

Chapter 6 Momentum
conservation of linear momentum- If the net external force on a system is zero, the total linear momentum of the system does not change.
impulse - The product of the force and the time during which it acts. This vector quantity is equal to the change in momentum. impulse=net force x time=change in momentum
linear momentum - A vector quantity equal to the product of an object’s mass and its velocity, p = mass x velocity.

There is no special unit for momentum as there is for force; the momentum unit is simply that of mass times velocity (or speed)—that is, kilogram meter per second (kg x m/s).

The word momentum is often used in our everyday language in a much looser sense, but it is still roughly consistent with its meaning in the physics world view; that is, something with a lot of momentum is hard to stop.

Because the changes in the momenta of the two objects are equal in size and opposite in direction, the value of the total momentum does not change. We say that the total momentum of the system is conserved.

net force = change in momentum/ time taken

The interaction that changes in object’s momentum—a force acting for a time interval—is called impulse. Because impulse is a product of two things, there are many ways to produce a particular change in momentum. For example, two ways of changing an object’s momentum by 10 kilogram-meters per second are to exert a net force of 5 newtons on the object for 2 seconds or to exert 100 newtons for 0.1 second. They each produce an impulse of 10 newton-seconds (N x   s) and therefore a momentum change of 10 kilogram-meters per second. The units of impulse (newton-seconds) are... [continues]

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