Fact 1: If an object is kicked then force is exerted on that object.

Fact 2: Control boxes are objects.

Given the two facts above, answer the question "what has forced extered on it if kicked?" with the following options: 
- animals
 - mussels
 - control boxes
 - heat energy
 - energy barrier
 - a hydraulic system
 - activation energy
 - kinetic energy


 

   control boxes      