Yes — you should be able to make silhouettes with the Coolpix S70, though the limited controls make it a bit harder.

To create a silhouette, place your subject in front of a bright background and expose for the background, not the subject. A simple method is to frame the bright background first, half-press the shutter to lock focus/exposure, then have your subject step into position and take the shot. Make sure flash is off.

The blur is likely from a shutter speed that’s too slow. Since your camera may not give much direct shutter control, try these steps:

• shoot a non-moving or slow-moving subject
• use a tripod or rest the camera on something steady
• expose for the bright background, which may help shorten the exposure
• if available, raise ISO in Auto mode to get a faster shutter speed, understanding this can add noise

Fast action silhouettes may be difficult with this camera, but still subjects, trees, fences, or posed people should be achievable.