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Shvoong Home>Books>laws of newton Review

# laws of newton

Book Review   by:shailen     Original Author: shailendra singh

Laws of Newton:

The first law states

a body shall continue in a state of rest or of uniform

motion in a straight line unless

impressed upon by a force.

This repeats Galileo’s idea of the natural state of a
body

and defines the nature of force.

The question of the frame of reference is now raised.
To

clarify the situation we shall regard

force to be the action of one body upon another. Thus
an

isolated body will move in a

straight line at constant speed relative to an inertial

frame of reference. This statement could

be regarded as defining an inertial fiame; more
discussion

occurs later.

The second law is

the rate of change of momentum is proportional to the

impressed force and takes place

in the same direction as the force.

This defines the magnitude of a force in terms of the
time

rate of change of the product

of mass and velocity. We need to assume that mass is
some

measure of the amount of

matter in a body and is tcrbe regarded as constant.

The first two laws &e more in the form of definitions
but

the third law which states that

to every action cforce) there is an equal and opposite

reaction cforce)

is a law which can be tested experimentally.

Newton’s law of gravity states that

the gravitational force of attraction between two
bodies,

one of mass m, and one of

mass m2. separated by a distance d, is proportional to

m,mJd2 and lies along the line

joining the two centres.

.
Published: April 07, 2006
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