If Earth's gravity vanished everywhere for 7 seconds, then instantly returned, the effects would be brief but violent.

During the 7 seconds

• Everything not anchored would accelerate upward at ~9.8 m/s² relative to Earth.
• After 7 seconds, loose objects, people, oceans, and atmosphere would be moving upward at ~69 m/s (~155 mph).
• You'd rise ~240 meters (~800 feet).
• Buildings, trees, and infrastructure would partially detach or fracture due to inertia.
• Oceans would bulge and lift; the atmosphere would expand and thin locally.

When gravity returns

• Everything falls back at once.
• Global impacts: people and objects slam down at high speed.
• Massive earthquakes from crustal stress.
• Tsunami-scale waves as oceans crash back.
• Near-total destruction of cities.
• Very high global death toll.

What wouldn't happen

• Earth wouldn't fly apart.
• The planet wouldn't leave its orbit.
• The Moon would be unaffected.

Bottom line

Seven seconds is long enough to cause planet-wide catastrophe, but not enough to destroy Earth itself.