models-mass weight denisty

Question 1

si unit of force

Answer 1

newton, N

Question 2

formula for wieght/force

Answer 2

W = mg

Question 3

gravitational field force / acceleration on earth

Answer 3

10N

Question 4

gravitational field force / acceleration on moon

Answer 4

1.6 Nkg -1

Question 5

density

Answer 5

mass per unit volume

Question 6

symbol used to rep density

Answer 6

p (rho)

Question 7

formula of density

Answer 7

mass over volume

Question 8

units of density

Answer 8

kg/mcube or g/cmcube

Question 9

laws of density

Answer 9

object sinks in a liquid of smaller density of its own otherwise it floats or is wholly submerged
an object is suspended in a liquid if it has a density equal to that of the liquid

Question 10

anomalous nature of water

Answer 10

abnormal property of water whereby it expands instead of contracting when the temperature goes from 4 to 0 degrees ,and becomes less dense

at 4 degrees, water has the highest density and contracts as the temperature rises from 0-4 degrees .hence in regions where winter is severe, lakes cool at the surface and when the water reaches 4 degrees water will be denser and hence sink so water that freezes will be at surface
layer acts as an insulation preventing or slowing down further cooling. results in top down freezing so aquatic life can survive below ice even if air temperature above is below 0 degrees