Final answer:
The friction force is at least 125 N.
Step-by-step explanation:
The friction force is at least 125 N in this case.
According to the information provided, the applied force of 125 N is greater than the maximum force of static friction. This means that the crate does not move and the friction force is at its maximum value, which is 125 N.
Therefore, the friction force in this case is at least 125 N.