Gravitation
Separate projectile components, interpret orbital free fall and apply universal gravitation.
How to study Higher Physics
Move between physical models, relationships, units, graphs and justified conclusions, while using current official materials for exact paper and assignment conditions.
Core concepts
Concept 1
free-fall measurement
Exam cue: Resolve initial velocity before analysing each perpendicular component.
Concept 2
independent horizontal and vertical projectile motion
Exam cue: Use a common flight time to link horizontal and vertical motion.
Concept 3
satellites as freely falling objects
Exam cue: Measure centre-to-centre separation in gravitational calculations.
Concept 4
Newton’s law of universal gravitation
Risk pitfalls and guardrails
Adding gravitational acceleration to the horizontal component.
Guardrail: Check assumptions, prefixes, units, significant figures and whether the statement is supported by evidence.
Using surface separation instead of centre separation.
Guardrail: Check assumptions, prefixes, units, significant figures and whether the statement is supported by evidence.
Saying an orbiting satellite has no gravity acting on it.
Guardrail: Check assumptions, prefixes, units, significant figures and whether the statement is supported by evidence.
Memory anchors
Projectile independence
Horizontal and vertical motion share time but are analysed independently.
Horizontal projectile acceleration
Neglecting resistance, it is zero.
Vertical projectile acceleration
It is g downward throughout the flight.
Satellite orbit
A satellite is in continuous free fall around the attracting body.
Universal gravitation
F = Gm₁m₂/r², where r is centre-to-centre separation.
Projectile velocity
Combine perpendicular components vectorially for magnitude and direction.
Checkpoint rule
Do the check-up only after you can summarize each concept in one sentence and identify one dangerous pitfall from memory.
Knowledge Check (after reading)
Short check-up to confirm understanding of this module.
Check-up Questions
Neglecting air resistance, which statement describes a projectile after launch?
A ball is launched horizontally at 12 m s⁻¹ and is airborne for 1.5 s. How far horizontally does it travel?
Answer all questions to submit.
Next step personalized recommendations
Continue learning
Move forward only after this module is stable.
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