Inertia is the tendency of an object to keep its velocity unless a net force changes it.
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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
Inertia is the tendency of an object to keep its velocity unless a net force changes it.
Motion does not require a continuous push in empty space; forces are needed to change speed or direction.
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HOW SCIENTISTS KNOW
Low-friction experiments and spacecraft coasting demonstrate inertial motion.
WORDS TO OWN
inertiavelocityforcemotion
!A COMMON WRONG MODEL
Inertia and Motion is only a name or picture to memorize.
✓REBUILD IT WITH EVIDENCE
Connect inertia and motion 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 inertia and motion using inertia and velocity.
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 inertia and motion?
Choose the explanation that matches the evidence—not just the most familiar words.
Three things to remember
✓Inertia is the tendency of an object to keep its velocity unless a net force changes it.
✓Motion does not require a continuous push in empty space; forces are needed to change speed or direction.
✓Evidence matters: low-friction experiments and spacecraft coasting demonstrate inertial motion.
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