Balanced: A person sitting on a bench, 10N left, 10N right, a car moving at 70mph on the motorway, 9.8N reaction force on Earth, A cup of tea on the table, A bird flying at the same speed 30m above ground, Unbalanced: A car setting off from traffic lights, 500N left, 510N right, A bus slowing down at a zebra crossing, Skydiver as they first jump out of the plane, A person jogging and then slowing down to rest, 1000N up, 2000N down,

Resultant forces

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