Science · Grades 8–11
Motion graphs and force reasoning · revision card
Speed is the magnitude of velocity. Acceleration is a change in velocity per unit time.
Keep these ideas clear
Velocity is directional
Speed is the magnitude of velocity. Acceleration is a change in velocity per unit time.
Net force matters
Zero net force means zero acceleration in an inertial frame, not necessarily zero velocity.
Two useful examples
A position–time graph is a straight line with positive slope. The object has
constant positive velocity
constant positive velocity
A horizontal position–time graph represents
constant position
constant position
Explain it without looking
- A student adds path lengths and calls the result displacement. Explain the distinction.
Further reading and review references
These are reference links, not copied exercises, institutional endorsement or proof of independent review.
Learning preview · teacher review required. Grade bands are approximate, not official curriculum alignment.