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Lecture

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PhysicsCourse Code

PHY100H1Professor

Vatche DeyirmenjianThis

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PHY101- LEC 4

Newton’s Third Law of Motion states that for every action force there is a reaction

force that has the same magnitude but points in the opposite direction.

Newton’s Theory of Gravitation

Newton’s Laws of Motion can be used to predict the paths of object in the night shy

such as the Moon, the planets, and the stars.

Newton developed a simple expression for the gravitational force between two

objects of mass M and mass m that are separated by a distance R.

m

FG = GMm/R2

G is called the Gravitational Constant

This expression does not depend on the composition of the object

The unit of force is called a Newton, in honour of Sir Isaac Newton. You can refer its

units for F=ma. If mass m is in kilograms kg and acceleration a is in m/s2

Then a Newton is a kg m/s2

All objects exert attractive gravitational force on one another

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