# 22-09-10 - o Your mass never changes in different places in...

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Wednesday, September-22-10 - Practice : Chapter 5, objective 1,8 problems 1,3, 10 ,11, 14 o Newton’s first law An Isolated object, free from external forces, will continue moving at constant velocity, or remain at rest o Newton’s second law F = ma Newton defines mass as a measure of an object’s inertia. o Forces A push or pull that tends a cause motion Due to f=ma the unit should be then 1 kg * m/s 2 = 1 newton (N) o Contact forces – direct contact is required o Non- Contacts forces : gravity, electromagnetic forces Gravitational force is also called weight and is in Newton’s F = mg o Mass = how much something tends to resist a force – take a book and put a spring with one newton on it and see how far it moves and divide it out o Mass is a measure of inertia o Weight is proportional to mass (weights are equal when masses are equal)

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Unformatted text preview: o Your mass never changes in different places in the universe o Gravity = universal force between masses. o F = G * Mm/ r 2 Force is proportional to each mass, and inversely proportional to the square of the distance between them o Answer to first quiz is the station is not an inertial reference frame o Newton’s Third Law(action and reaction) Whenever object A exerts a force on object B, object B simultaneously exerts an equal, opposite force back to A. If gravity pushes on a block then the block pulls the earth up If a table pushes on block. Then the block pushes down on table Balloon pushes air backwards. Then air pushes balloon forwards. Pressure forces on balloon everywhere but where the hole is it is the least amount of pressure....
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## This note was uploaded on 10/22/2010 for the course PHYSICS 1D03 taught by Professor N. mckay during the Spring '08 term at McMaster University.

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22-09-10 - o Your mass never changes in different places in...

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