Page 158 - York Global Science 6 - Physical Science

Fossil fuel – Fuels made underground from dead plants and animals millions
of years ago (for example coal, oil, natural gas).

Frame of reference – A line or object that is used to measure movement.
Freeze – To lower the temperature of a liquid so that it changes to a solid.
Freezing point – The temperature at which a liquid becomes a solid.

Friction – The force that makes it difficult for one object to move along the
surface of another.

Fulcrum – The point at which a bar is supported.
Geothermal energy – Energy that comes from hot water and steam from
below the Earth.

Gradient – How steep a slope is.

Graph – A drawing that shows the relationship between different types of
information.
Gravel – Small stones often mixed with sand.

Gravitational pull – The force from one object that pulls other objects towards it.
Gravity – A non-contact force that pulls things down.

Groundwater – Water that is found in the soil and rocks in the ground.
Heat energy – Energy which comes from the movement of particles.

High concentration – A lot of something in one place.

Horizontal – A straight line that is parallel to the ground.
Hydrologist – A person who studies water on Earth.

Hydropower – A way of making electricity from moving water.
Inclined plane – A surface at an angle; a ramp.

Insoluble – Cannot be dissolved.
Insulator – Something that does not dissolve.

Irreversible – Cannot change back.
Joule – A unit of energy.

Kilowatt – 1000 watts.
Kilowatt-hour – A unit of measurement where 1 kWh is how much energy a

1000 W appliance uses in one hour.
Kinetic energy – Energy that a moving object has.

Lever – A bar that can be pushed or pulled over a fixed point to lift something.
Load – The amount of weight.

Low concentration – Not much of something in one place.
Magnetic field – The area around a magnet where the magnetic force acts.
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