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# 7K Forces

### Key words

TermDefinition
Force A push, pull, or change of shape
Air resistance The friction of air molecules hitting a moving object
Friction The force of two objects touching
Contact forces A force where there needs to be contact for it to have an effect
Gram Unit for measuring mass (g)
Kilogram 1000 grams (kg)
Gravity The force of attraction between two masses
Magnetism The force of attraction due to magnetic fields
Mass The amount of matter an object contains
Weight The force of gravity on an object
Newton The unit of force (N)
Non-contact force A force that can act on something from a distance
Static electricity A force due to electric fields
Upthrust A force that pushes things up in liquids and gases
Water resistance The friction of water molecules hitting a moving object
Drag See air and water resistance
Compress To squash or make smaller
Elastic A material that can change back to its original shape when a force is removed
Elastic limit The point beyond which a substance is no longer elastic
Extension The distance to which a material has been stretched
Force meter Instrument to measure force
Hooke’s Law The extension of a spring is proportional to the force applied
Limit of proportionality Elastic limit
Plastic A material that can change shape but does not return to its original shape
Stretch To make something longer
Lubricant A substance to reduce friction
Pascal The unit for pressure (Pa). 1 Pa = 1N/m2
Pressure The amount of force pushing on a certain area
SI unit Standard International Unit
Balanced forces When two forces are equal and opposite
Stationary Not moving
Unbalanced forces Forces that are either not equal and/or not opposite
Created by: andrewweng0406