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What is the difference between balanced and unbalanced forces?
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Balanced forces are forces on an object whose vector sum is zero. Unbalanced forces produce a nonzero net force.
Key points
- Balanced forces: all forces cancel each other so the net force Fnet = 0. The object's state of motion does not change — it remains at rest or moves at constant velocity (Newton’s first law). Example: a book resting on a table — gravity downward is exactly balanced by the table’s normal force upward.
- Unbalanced forces: forces do not cancel, so Fnet ≠ 0. That net force causes the object to accelerate (change speed or direction) according to Fnet = ma (Newton’s second law). Example: pushing a stalled car with more force than friction — the net force makes the car start moving.
Remember: “balanced” does not mean no forces are present — it means the forces add up to zero.
Key points
- Balanced forces: all forces cancel each other so the net force Fnet = 0. The object's state of motion does not change — it remains at rest or moves at constant velocity (Newton’s first law). Example: a book resting on a table — gravity downward is exactly balanced by the table’s normal force upward.
- Unbalanced forces: forces do not cancel, so Fnet ≠ 0. That net force causes the object to accelerate (change speed or direction) according to Fnet = ma (Newton’s second law). Example: pushing a stalled car with more force than friction — the net force makes the car start moving.
Remember: “balanced” does not mean no forces are present — it means the forces add up to zero.
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