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⚖️ Balanced and Unbalanced Forces

When forces are equal and opposite they balance out and nothing changes; when one is bigger the forces are unbalanced and movement changes. Learn to tell them apart.

lessons

~15 min

to learn

🔬 Science

subject

Ages 6–12

level

Start the course →

What you’ll learn

When Forces Are EqualUnderstand that balanced forces are equal and opposite and cause no change in movement.Balanced forces are equal in size and opposite in direction, so they cancel each other out. When forces are balanced, an object's movement does not change — a still object stays still.
When Forces Are UnequalUnderstand that unbalanced forces are unequal and change an object's movement.Unbalanced forces are not equal — one is stronger than the other, so they do not cancel out. When forces are unbalanced, the object's movement changes: it speeds up, slows down or changes direction, moving toward the bigger force.
Spotting the DifferenceTell balanced and unbalanced forces apart by looking at whether movement changes.The difference is whether the forces are equal. Balanced forces cancel out and movement stays the same, like a book resting on a table. Unbalanced forces do not cancel, so movement changes, like a car speeding up.

Questions this course answers

What are balanced forces?

Balanced forces are equal in size and opposite in direction, so they cancel out.

When the forces on an object are balanced, its movement...

When forces are balanced they cancel out, so the object's movement does not change.

What makes forces unbalanced?

Unbalanced forces are not equal — one is stronger, so they do not cancel out.

When forces are unbalanced, what happens to the object?

Unbalanced forces make an object's movement change — it speeds up, slows down or changes direction.

A book rests still on a table. The forces on it are...

Gravity pulls the book down while the table pushes up with an equal force, so the forces are balanced and it stays still.

Which situation shows UNBALANCED forces?

A car speeding up has unbalanced forces, because a bigger force changes its movement.

Grounded in trusted sources

BBC Bitesize — Balanced and unbalanced forces
The Physics Classroom

Every Wunder lesson is built from real, reputable sources — never invented.

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