Thẻ ghi nhớ: Unit 3: Forces and energy (0893, Stage 7 Science) | Quizlet

Earth

Third planet from the sun

mass

A measure of the amount of matter in an object

gravity

A force of attraction between objects that is due to their masses.

acts towards the centre

gravity causes a force which pulls objects towards the centre of a planet or star

force of gravity

a force of attraction which is an example of a non-contact force

weight

A measure of the force of gravity on an object

newtons

The unit of measurement for force and weight

contact force

a push or pull on one object by another that is touching it

quantity

the amount of something; _________ is preferred in science to "amount"

kilograms

unit for mass

formula triangle

a method of using an equation

accurate

being close to a true value

observe

to see; to notice

formed

made or organized

evidence

facts that support or contradict a hypothesis

hypothesis

A testable prediction

orbit

the path of a planet around the Sun or a satellite (natural or artificial) around a planet

spin

the circular movement of a planet around its own axis, such as causes day and night on Earth

axis

An imaginary line that passes through Earth's center and the North and South poles, about which Earth rotates

planet

A large body in space that orbits a star and does not produce light of its own

nebula

A large cloud of dust and gas in space

model

A representation of an object or event

support

Back up with details

contradict

to speak against; to say the opposite

circular

having the shape of a circle

speed

The distance an object travels per unit of time

air resistance

force that opposes the motion of objects that move through the air

vacuum

A space where no particles of matter exist

depth

the distance from the bottom of the ocean to the surface of the ocean; how deep the ocean is

harbour

an area of water near the coast where ships are kept and are safe from the sea

coastal

located on or near or bordering on a coast

tide

The periodic rise and fall of the level of water in the ocean

tidal range

The difference in levels of ocean water at high tide and low tide

Earth tide

the rise and fall of the land surface as a result of tidal forces

tidal force

the force from the gravitational pull of the Moon and the Sun that causes tides on Earth

low tide

The time at which the tide reaches its lowest level

high tide

The time at which the tide reaches its highest level

earthquake

The shaking that results from the movement of rock beneath Earth's surface.

volcano

A weak spot in the crust where magma has come to the surface

force of attraction

A force that pulls objects together

energy

the ability to do work

transferred

passed from one place or form to another

stored energy

energy contained in one place

kinetic

relating to movement

joule

the unit of energy

chemical energy

A form of energy that is stored in food and fuels

electrical energy

Energy caused by the movement of electrons.

sound energy

Energy caused by an object's vibrations

light energy

Energy in the form of moving waves of light

thermal energy

The total energy of all the particles of an object.

elastic potential energy

the energy of stretched or compressed objects

gravitational potential energy

Energy stored by objects due to their position above Earth's surface.

fuel

a material that releases energy when it burns

luminous

giving off light

changes in energy

when energy changes from one state to another

change

to make or become different

process

A series of actions or steps taken to achieve an end

event

anything that happens or is regarded as happening

useful

helpful; energy changed in the way that we want

wasted energy

Energy that is not usefully transferred

dissipated energy

energy used up in a system, typically lost due to work done by friction, 'wasted energy'

recovered

collected and used again

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