give some idia how to make a working model of science?

Question

i m in class 8 i have to make a working model please give some idia.

Answer 1

Some ideas? Glad to assist. I think you are trying to make a working model for a science project. First, you have to decide, which branch of science e.g. physics, chemistry, or biology/zoology.
Physics - simple pulleys, levers, fulcrums that illustrate how mankind overcome their physical limitations using the above principles.
Chemistry - acid/alkali nature of everyday products like soap etc and their chemical nature and properties.
Biology/Zoology - Germinating bean shoots and illustrating properties of monocotyledons e.g tap roots as different to fibrous roots.
Use illustrations on cardboards, create interest and excitement e.g have the different stages of the plant growth by growing them on different days to illustrate the different stage of growth. The same can be said of Mosquito development, frog etc.
Good Luck. Have fun doing them.

Answer 2

a million.deliver one ball bearing (diameter 2 inches) 2.bypass to wood worker. Order for 2 flat ply of length 8inchX8inch. certainly one of them needs to have hollow at centre of a million inch diameter. different needs to have a hollow of diameter 2inches so as that ball bearing suits into it. 3.Order for a rod of reducing diameter from 3/4 inch to 2.5inch. 4. Now permit the rod bypass for the time of the hollow of 2d ply then first ply(without bearing). 5.Rotate the two plys along with your hand. 6.See that the ply with bearing rotates for an prolonged time. This shows that the BALL BEARING REDUCES FRICTION TO minimum.