Post on 20-Mar-2017
transcript
ÁNGEL AYUSO-MORALES MOYA5º PRIMARIA
MAESTRO JUAN DE ÁVILANATURAL SCIENCE UNIT 7
MATTER AND FORCES
ATOMS-> Matter is made out of tiny particles called atomsMOLECULES-> Some atoms join together to make groups know as molecules.
MATTER AND ITS PROPERTIES
COLORSODOURTASTEVOLUME: Describes how much space matter
occupies. We measure volume in milliliters (ml) 1000 milliliters = 1 litreMASS: Is the amount of matter in an object. We
measure mass in grams (g) 1000 grams = 1 kilogram
THERMAL CONDUCTIVITY-> Is the ability of certain substances to conduct o transfer heat. Metals, such as iron or copper, are good heat conductors, while materials such as wool, wood, paper, plastic or glass are good heat insulators.
DENSITY-> Is the amount of matter in a volume. We measure density in kilograms per litre (kg/l)
Density = mass/volume
HARDNESS-> Is the scratch-resistance of a solid. Diamonds are the hardest natural solids.
SOLUBILITY-> Is the ability of a substance to dissolve in other substance and form a solution. Sugar dissolves well in water, whereas oil does not.
PURE SUBSTANCES-> Consist of only one type of matter. Such as table salt or silver
WHAT TYPES OF MATTER ARE THERE?
MIXTURES (made up two or more pure substances)
HETEROGENEOUS MIXTURE:
(You can see the individual substances. Such as sand or
a salad).
HOMOGENEOUS MIXTURE
(You cannot see the individual substances. Such as the air we breathe or sea
water).
FILTRATION-> Using a filter. When we pour the juice of a lemon through a filter, the solids stay in the filter, and the liquid passes through it.
SUSBTANCES IN A MIXTURE CAN BE SEPATED USING DIFFERENT METHODS
EVAPORATION-> Heating. When we heat a mixture of salt and water, the liquid evaporates and leaves only the solids which crystallise and form salt crystals.
SIEVING-> Using sieve. We use sieve to separate solids of different sizes, such as pebbles from sand.
FORCE-> Is a push or pull that acts on an object.
Can make things: *move *stop *speed up *slow down *change direction
MATTER AND ITS PROPERTIES
TYPES OF FORCES
NON-CONTACT FORCES
(act through physical contact)
CONTACT FORCES
(They act through physical contact)
CONTACT FORCES (They act through physical contact)
-FRICTION-> Force when two objects rub against each other. Its acts in the opposite direction of the movement. E.g. Air (parachute)
Water (kayak or boat)
- BUOYANCY-> is the ability of objects to float. It is upward force acting in the opposite direction to gravity.
NON-CONTACT FORCES (act through physical contact)
-MAGNETISM: Is a force of attraction or repulsion (magnets attract metal and make compasses work)
- GRAVITY: Is a force which attracts all objects towards each other. Planets have a stronger gravitational force. Astronauts float because in space there is no gravity.
STATES OF MATTERSTATES OF MATTER