A trajectory is a path determined by starting speed, direction and the forces acting during motion.
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LIVE VISUAL LAB
MASS
Gravity bends forward motion into an orbit.
Interactive teaching model • relationships are controlled; scale, distance or timing may be simplified and are labeled here.
The big idea
A trajectory is a path determined by starting speed, direction and the forces acting during motion.
Changing any of those conditions changes where a spacecraft travels.
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HOW SCIENTISTS KNOW
Tracking stations measure position and velocity, then compare them with predicted paths.
WORDS TO OWN
speeddirectiontrajectoryvelocity
!A COMMON WRONG MODEL
Speed, Direction, and Trajectory is only a name or picture to memorize.
✓REBUILD IT WITH EVIDENCE
Connect speed, direction, and trajectory to the observable relationship, evidence and system described in the lesson.
A scientifically true sentence can still create a false picture. This repair makes the relationship visible.
Take learning into real life
Try it together
Make a motion test with a safe ball, a ramp made from a book and tape marks. Change only one variable, measure the result and name the force involved. Connect what you notice to speed, direction, and trajectory using speed and direction.
GREEN SAFETYOrdinary low-risk activity with normal caregiver awareness.
01TALKWhat do you predict before we try it?02LOOKWhat changed? What stayed the same?03EXPLAINWhich evidence supports your idea?
Check understanding
Which statement best explains speed, direction, and trajectory?
Choose the explanation that matches the evidence—not just the most familiar words.
Three things to remember
✓A trajectory is a path determined by starting speed, direction and the forces acting during motion.
✓Changing any of those conditions changes where a spacecraft travels.
✓Evidence matters: tracking stations measure position and velocity, then compare them with predicted paths.
SPACE FIRST CLASS My journey