Sec1 Sci P7f WL Forces and speed 29words (UK KS3 7k & 9k)
Terms in this set (30)
When two forces are the same strength, but working in opposite directions.
A force that needs to touch an object before it can affect it (e.g. friction).
The amount of mass that 1cm3 of a substance has. Measured in g/cm3.
Any substance that will return to its original shape and size after it has been stretched or squashed.
A push or a pull.
Piece of equipment containing a spring, used to measure forces.
A force that tries to slow things down when two things rub against each other.
A unit for measuring mass (g).
A unit for measuring mass (kg). There are 1000 g in 1 kg.
A non-contact force that attracts objects made out of iron.
The amount of matter that something is made of. Measured in grams (g) and kilograms (kg). Your mass does not change if you go into space or to another planet.
The unit of force (N).
Another name for a force meter.
A force that can affect something from a distance (e.g. gravity).
When two forces working in opposite directions are not the same strength.
A force that pushes thing up.
The amount of force with which gravity pulls something towards the Earth. It is measured in newtons (N).
A force that tries to slow down things that are moving through the air. It is a type of friction.
A graph that shows how far and how fast something travels during a journey.
KILOMETRES PER HOUR (KM/H)
Units for speed when the distance is measured in kilometres and the time is measured in hours.
The total distance something travels divided by the total time taken allows you to calculate the thing's mean or average speed.
METRES PER SECOND (M/S)
Units for speed when the distance is measured in metres and the time is measured in seconds.
How fast something is moving. Often measured in metres per second (m/s), miles per hour (mph) or kilometres per hour (km/h).
Air resistance and water resistance are both sometimes called drag.
A substance (normally a liquid) used to reduce friction.
Adding a lubricant to something.
A force which attracts things with extra electrical charges on them.
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