Final answer:
Friction is the force that inhibits plate movement in plate tectonics.
Step-by-step explanation:
In plate tectonics, the force that inhibits (slows) plate movement is friction. Friction occurs as plates slide past each other, causing resistance that opposes their movement. This friction is caused by the uneven surfaces of the rocks that make up the plates.
When two plates are locked together due to friction, increasing stress can build up. Eventually, this stress overcomes the force of friction and the plates suddenly slip, resulting in an earthquake. Friction plays a crucial role in restraining plate movement and building up energy that is later released during seismic events.
Other factors, such as the force of gravity, also play a role in restraining plate movement to some extent. However, friction is the primary force that inhibits plate movement.
Learn more about Plate tectonics