Resultant forces, free-body diagrams and terminal velocity

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Determine the resultant force from two or more forces acting along a line, including forces acting in opposite directions.
Explain the effect of balanced and unbalanced forces on an object’s motion, including rest, constant velocity and acceleration.
Draw and interpret free-body diagrams showing the size and direction of forces acting on an object.

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Explain how terminal velocity arises when resistive forces increase with speed until they balance weight or driving force.

Apply force ideas to falling objects, moving vehicles and other familiar situations, identifying how resultant force changes as speed changes.

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