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| style="height:20px; width:200px; text-align:center;" |The [[plane]] produces [[thrust]] by sending [[air]] backwards very quickly using the propeller.
| style="height:20px; width:200px; text-align:center;" |The [[submarine]] produces [[thrust]] by sending [[water]] backwards very quickly using the propeller.
|}
==Key Stage 4==
===Meaning===
'''Thrust''' is a [[force]] provided sending a [[fluid]] back to propel the [[object]] forward.
===About Thrust===
: '''Thrust''' is a [[force]] so it is [[Measure|measured]] in [[Newton]]s.
: '''Thrust''' is a [[Contact Force|contact force]] because a turbine or propeller must be in contact with the [[fluid]] being used.
: '''Thrust''' can cause a vehicle to [[accelerate]] and can act to counter [[Air Resistance|air resistance]] and [[friction]] to keep a vehicle travelling at a constant [[speed]].
''NB: The [[fluid]] does not need to 'push' against any other material already there. The [[force]] is provided because sending [[mass]] in the opposite direction to the direction you want to go.''
: '''Thrust''' acts by applying a [[force]] to the [[fluid]] around it to [[accelerate]] the [[fluid]] backwards. The [[fluid]] provides a [[Reaction Force|reaction force]] to push the [[object]] forwards.
===Example===
{| class="wikitable"
|-
|[[File:ThrustPlane.png|center|300px]]
|[[File:ThrustSubmarine.png|center|300px]]
|-
| style="height:20px; width:200px; text-align:center;" |The [[plane]] produces [[thrust]] by sending [[air]] backwards very quickly using the propeller. The [[air]] provides a [[Reaction Force|reaction force]] equal in [[magnitude]] but opposite in direction causing the [[plane]] to [[accelerate]].
| style="height:20px; width:200px; text-align:center;" |The [[submarine]] produces [[thrust]] by sending [[water]] backwards very quickly using the propeller. The [[water]] provides a [[Reaction Force|reaction force]] equal in [[magnitude]] but opposite in direction causing the [[submarine]] to [[accelerate]].
|}