Watch the Classic Hard Rock online guitar lesson by Angus Clark from Hard Rock Survival Guide: Rhythm
Here's a two-part exercise. The first section is a classic sounding groove where you've got to negotiate some single note riffage in between the chords. The second section is a moody arpeggiated section where we use the open G string to create some really colorful chords. I'm going to back off the volume on the guitar to clean up the tone for this. Take note of how and when I do this, it's a technique you'll want to get comfortable with. And I apologize in advance for the C minor voicing - it's just an example of the kind of problem solving you need to do when working out a rhythm part. It's the only voicing that made sense.