Option 1 suggests that a simple machine reduces the amount of work required. This is incorrect as the total work done remains the same but the force required to do that work decreases.

Option 2 is the correct answer. A simple machine allows us to apply less force to complete the same work, by increasing the distance over which the force is applied.

Option 3 indicates that a simple machine enables us to perform the same work but does not specify any change in force or speed.

Option 4 indicates that a simple machine allows us to do the same work much faster. This is incorrect as the speed of work execution isn`t generally affected by simple machines.

Thus, a simple machine’s primary function is to ease the physical load by letting us apply lesser force, hence the correct answer is option 2.