I do not believe it would be easier to push do to the fact the crate would then be top heavy and would have the tendency to tip over easily. Unless the center of gravity was towards the bottom and Johnny was pushing at the bottom.
Since motion is relative then yes friction can point in the direction of motion. This would only work if the thing that is causing the friction is moving in the opposite direction to the force pushing the object. An example is a person pushing a heavy box from the front to the rear of a fast moving train. Relative to the person pushing the box the frictional force is opposite to direction of travel but relative to a person standing next to the train the frictional force is the same direction as the box is travelling.
Friction can make it easier to accelerate something or harder to. More friction on the object being accelerated means it is more difficult to accelerate it. You and a friend are pushing a heavy crate down a street from a standing start. It's difficult to accelerate it. Now try the same thing on a street that is covered with ice. (The two of you have spikes on your shoes.) Better acceleration.
Pushing a heavy rock
what will be the net force on the object?will the object move?to what direction will it move?
rolling friction is less than sliding friction
in front of it
Examples of SLIDING FRICTION is pushing a heavy rock in your path, or moving a box on the floor.
tunes of danger it can make flods and mud slides and much more
It can make moving heavy objects easier for example sliding friction you can slide it or rolling friction you can roll the object across some kind of round cylinders or even fluid friction with water running under the object can make it easier.