UNIT ABBREVIATIONS GRAMS: g KILOGRAMS: kg SQUARE MILIMETRES: mm
CUBIC METRES: m KILOGRAMS PER CUBIC METRE: kg/m
Slide 4
CROSS-SECTIONAL AREA = r (adjective+noun): The area of what you
see when you cut through the middle of something so that you can
see its layers. If a cables cross-sectional area increases, it can
carry more elecricity safely.
Slide 5
SURFACE AREA (noun+noun): The amount of surface that is in
contact with the air To find the surface area of a cylinder, you
need to add the top, bottom and side areas together.
Slide 6
SMALL-SECTION (adjective): Something that has a small
cross-sectional area A group of small section cables are used in
power lines
Slide 7
LARGE-SECTION (adjective): Something that has a large
cross-sectional area We are changing the pipes in our house. We are
replacing then with large- section pipes.
Slide 8
WEIGHT (noun): how heavy something is, which can be measured in
kilograms She is trying to lose weight.
Slide 9
WEIGH (verb): To have a particular weight You need to weigh
your luggage before going to the airport.
Slide 10
MASS (noun): The quantity of material that something contains
which can be measured in kilograms or Newtons. Weight is used in
non- technical language for this meaning. The mass of an object is
the same on Earth and Moon, but the weight of an object is
different.
Slide 11
GRAVITY (noun): The force that attracts objects in space
towards each other and pulls them towards the centre of Earth
Gravity keeps the planets in orbit around the Sun.
Slide 12
WEIGHTLESS (adjective): Having no weight because there is no
gravity Astronauts work in weightless conditions.
Slide 13
VOLUME (noun): The amount of space that an object fills. It is
measured in m. There are jars of different volumes in the
kitchen.
Slide 14
DENSITY (noun): The amount of matter in a certain volume of
space and it is measured by mass per unit of volume Density can be
changed by pressure or temperature.
Slide 15
DENSE (adjective): Having high density As you go up a mountain,
the air becomes less dense.
Slide 16
LIGHTWEIGHT (adjective): not heavy I bought a new lightweight
bike.
Slide 17
Tic-Tac-Toe Directions: Divide the class into two teams (Xs and
Os). Draw a grid on the board. Ask the X group to answer one of the
questions. If they get it right, Put an X on the grid. Do the same
for group O. The group with a row of Xs or Os win. Books are
closed.
Slide 18
__________________ is a unit of density. The fog is very
___________. I cant see the road. The ____________ of an object is
measured in kg not N. The _____________ on the Moon is 1/6 of the
Earth. There is almost no pull of the Moon. These bags __________
15 pounds. The formula for the _____________ of a cube is 6a
______________ is measured in m . r is the formula for
________________ of a circular object. On the Moon, astronauts feel
almost _______________. Words: Weight, weigh, mass, density, dense,
weightless, small-section, large- section, cross-sectional area,
surface area, grams, square milimetres, cubic metres, kilograms per
cubic metres, gravity
