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: Some [[force]]s can act at a distance, but a '''contact force''' only exists when [[object]]s are in '''contact'''.
The '''contact forces''' you should know are:
*[[Normal Contact Force]]
*[[Friction]]
*[[Air Resistance]]
*[[Thrust]]
*[[Lift]]
==Key Stage 4==
===Meaning===
A '''contact force''' is a [[force]] that only acts when [[object]]s are 'touching' one another.
===About Contact Forces===
: Some [[force]]s can act at a [[distance]], but a '''contact force''' only exists when [[object]]s are in '''contact'''.
The '''contact forces''' you should know are:
*[[Normal Contact Force]]
*[[Friction]]
*[[Air Resistance]]
*[[Water Resistance]]
*[[Upthrust]]
*[[Driving Force]]
*[[Thrust]]
*[[Lift]]
*[[Tension]]