Page 134 - SCERT Kerala State Syllabus 8th Standard Basic Science Textbooks English Medium Part 1_Neat

When an object is pushed or pulled, a force is being
Sir, Isaac Newton
applied on it.
(1642-1727)
We know that the unit of force is newton. It is indicated by
the letter N.

Is force all about a push and pull? Let’s examine.
Observe the pictures given below.

He was born at Woolsthorpe
in England. The laws of
motion, law of gravitation
etc., are among his
important discoveries. He
was conferred with the title
‘Sir’ in 1705. His famous
book philosophia naturalis
Fig. 10.2 (a) Fig. 10.2 (b) Fig. 10.2 (c)
Principia Mathematica is a
pioneering work in the world
of Science.

Fig. 10.2 (d) Fig. 10.2 (e) Fig. 10.2 (f)
One newton force
After analysing the pictures, write down in the table below
the results of applying force on different objects. An approximate force of I N
must be applied against the
Activity Result
force of gravitation, to hold
an object of mass 0.1 kg
Applying force on a rolling The ball comes to rest.
(100 g), parallel to the
ball, slowly pushing it in the ground, in the palm.
opposite direction with the
leg.
The wall has a
Pushing a wall
tendency to move.

Table 10.2
From the discussions we had so far, what did you
understand about force? Write it down in your science
diary.
see "Aamukham" in School
Force is that which changes or tends to change the shape, Resources in IT @ School
size, volume, state of rest or state of motion of a body. Edubuntu

Basic Science VIII 133