Forces

Forces are pushes or pulls that can change an object's motion. They are fundamental to understanding how everything in the universe interacts, from the smallest particles to the largest galaxies.

Four smooth rocks balanced perfectly on top of each other in a tall stack.
These rocks stay still because the forces acting on them are balanced. Gravity pulls the rocks down, but the rocks underneath push back up with the same amount of strength.

Concepts in Forces

Explore the fundamental ideas behind forces and their effects on objects.


Put your understanding of forces into practice with these skills.

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Practice Problems

Test your knowledge and apply force principles with these problems.

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