Definition: Terminal velocity occurs when the upward forces (drag and buoyancy) equal the downward force of gravity, resulting in constant velocity.

Highlight: Force equals mass times acceleration (F = ma), and weight equals mass times gravity (W = mg).

Example: For objects on Earth, the gravitational field strength is 10N/kg, which helps calculate weight from mass.

Vocabulary: Balanced forces have equal magnitude in opposite directions, while unbalanced forces result in acceleration.

Definition: Forces are vector quantities that have both magnitude and direction, capable of changing an object's motion or shape.

Vocabulary: Contact forces require physical touching between objects (friction, reaction force), while non-contact forces act at a distance (gravity, magnetic force).

Example: Speed calculation demonstrated through distance-time relationship: Speed = distance/time For instance, 10/5 = 1.5 m/s

Highlight: Understanding vectors is crucial as forces have both direction and magnitude, making them different from scalar quantities.