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You have to make sure that your abs are contracting so you can't just keep your back straight the whole time, it's going to have to curl up some. The role of the abs are to bring your rib cage to your pelvis, not your shoulders to your knees. So when you do your crunces make sure you are 'curling' your torso in order to bring your ribs down to your pelvis. Doing the standard sit-up in which you basically keep your back straight doesn't contract your abs, it mainly only works the hip flexors. And remember to train your abs last in a workout because they protect your lower back from injury, so if they're already tired and you do back extensions next you could end up injuring yourself.
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