5.3,5.4 density

what are the differences in density of different states of matter?

Solids are often very dense -they have a high mass for a certain volume. Liquids are often less dense then solids and gases have very low densities because the molecules are more spread out (same mass, over a larger volume)

meaning of density

The density of a substance is its mass per unit volume. It is the measure of the compactness of a substance. It states how many kg/g is the mass of one meter/cm cube of the material.

what is volume

it is the quantity of space an obejtc takes up. Measure in Cm3 or ml. 1cm3= 1ml so 1000cm3=1 litre (l xl xl)

It is the quantity of three-dimensional space enclosed by a closed surface.It has the symbol V and is measured in the SI unit of meters cubed, m3. Volume is a scalar quantity.

what is mass

it is the measure of hte quanittiy of matter in an object relative to the observer. It is a scalar with SI unit kg. It has the symbol m and is measured in the SI unit of kilograms, kg. Mass is a scalar quantity,

Things mass affects

Mass is both a property of a physical body and a measure of its resistance to acceleration (a change in its state of motion) when a net force is applied. An object's mass also determines the strength of its gravitational attraction to other bodies.

is density scalar or vector

Factors affecting an object's volume will affect the magnitude of its density. Density is a scalar quantity.

density formula:

Density=mass/volume or p(rho)=m/v mass(m)= kg volume (v) = m3 density (p)= kg/m3 or g/cm3

difference between materials made using low density and high density?

Objects made from low density materials typically have a low mass. Similarly sized objects made from high density materials have a high massFor example, a bag full of feathers is far lighter compared to a similar bag full of metal.Or another example, a balloon is less dense than a small bar of lead despite occupying a larger volume. DEnsity doesn't vary with size or shape

when will an object float

when it is less dense than the liquid/fluid it si in. Floatign made possible by an upward force produced whenever an obejct is immersed in a liquid or gas eg hot air less dense then cold air so will rise upwards

what si the upward force on water

Upthrust is a force that pushes upwards on an object submerged in a fluid i.e. liquids and gases It is always in the opposite direction to the object's weight.This is why boats, and objects that are less dense than water, float.

how to measure volume of regular objects?

regular hsape= l x w x h
cylinder= pie x r2 x h

sphere= 4/3 pie r3

how to calcualte volume using measuring cylidner?

Regular and irrecualr shape- lowered into partially filled measurign cylinder. Rise is level on the voluem scale gived voluem of solid. If floats weight down with lump of metal-tital voluem found then voluem of metal-total.
do V2-V1 =voluem of obejct.
for liquid- pour in cylinder and read scale
always measure mass first in irregualr objects as measuring volume first may cause a change in mass as water of surface

hwo to find volume using dispalcement/eureka can?

irregular/regular shape:
-if object too big for emasurign cylinder. Fill up displacement can up to level of spout. Let overflow and wait for surplus water ot run out. Then lower soldi in water-it displaced its own volume of water. Collect displaced water in beaker and empty in measurign cylinder-read

how to measure mass using top pan balance

Reefular/irregualr shape:
place on balance and read
Liquid:
measure empty measurign cylinder (m1), add liquid and read scale (m2) then m2-m1
or
put empty cylinder, zero,put water and measure mass

hwo to measure mass using balance (moment)

Irregualr/regualr shape:
palce knwon mass on one end and unkown on other until balances. Thsi is realing cpmparing weights rather then masses. Masses cna be compared bcs of the way gravity acts on them-constant throughout earth. If hte obejcts have the same weight they must have same mass

what is voluem easured using

measurign cylinder,beaker

what si mass measured using

top pan balance , weighting scale, beam balance

how to measure weight

newton meter/ spring balance