A block is dragged at constant velocity in a straight-line path across a level surface by a force of 6N. What is the force of friction between the block and the surface?

more than 6N

To find the force of friction between the block and the surface, we need to use the concept of Newton's second law of motion, which states that the net force acting on an object is equal to the product of its mass and acceleration.

In this case, since the block is moving at a constant velocity, we know that its acceleration is zero. Therefore, the net force acting on the block must also be zero. This means that the force of friction is equal in magnitude and opposite in direction to the applied force.

So, since the applied force is 6N, the force of friction between the block and the surface is also 6N in the opposite direction.