Page 160 - York Global Science 6 - Physical Science

Power – How much energy is used per unit of time.

Precipitation – Water falling from the sky, as rain, snow or hail.

Property – Something we can see, feel or measure, for example density.
Proton – Part of an atom with a positive (+) electrical charge.

Pulley – A wheel and rope used to move heavy objects up and down.
Radiation – Energy from heat or light that travels in waves.

Rainfall – How much rain falls.

Random – Without a fixed pattern; by chance.
Reaction force – A force acting in the opposite direction.

Recycle – To use again.
Relative motion – The motion of two objects compared to each other.

Relative speed – The speed of two objects compared to each other.

Renewable energy – Energy that can be replaced after it is used. It comes
from the Sun, wind, etc. not fossil fuels.
Repel – To push something away.

Residue – The solid part left after filtration.

Reversible – Can be changed back to what it was before.
Screw – A small metal pin that can be rotated, and used to join things together.

Sedentary – Sitting; not being active.

Separate – To put into different parts.
Shock – A pain you feel when you are in contact with electricity.

Simple machine – A mechanical device with one action.
Sink – To go down below the surface, or to the bottom of, a liquid.

Solar energy – Energy that uses the power of the Sun to make electricity.
Solar System – The Sun and the planets that orbit it.

Soluble – Can be dissolved to make a solution.

Solute – A substance dissolved in another substance.
Solution – A liquid with other substances dissolved in it.

Solvent – A liquid that solids will dissolve in.

Source – Where something comes from.
Spark – A flash of light made by electricity.

Specific heat capacity – The amount of energy needed to raise the
temperature of a substance by a specific amount.

Speed – A measure of how fast something is moving.
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