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Air resistance
Air resistance is the frictional force acting on objects moving through air.
Compression
Compression is a pushing force in a squashed object.
Force
A force is a mechanical interaction between two objects or bodies.
Free-body diagram
A free-body diagram (FBD) is a simplified drawing that shows an object as a dot or box, with arrows for all external forces acting on it.
Friction
Friction is a force that opposes motion between surfaces in contact.
Lift
Lift is the upward force produced by wings moving through air.
Normal reaction
A contact force exerted by a surface on an object, acting perpendicular to the surface.
Resultant force
The resultant force is the single force that has the same effect as all the forces acting together.
Tension
Tension is a pulling force in a stretched object.
Upthrust
Upthrust is the upward force exerted by a fluid on an object.
Weight
The gravitational force acting on an object due to a gravitational field.