Projectile Motion and Orbits
Separate horizontal constant velocity from vertical constant acceleration and connect projectile motion to satellite orbits.
How to study National 5 Physics
Move from a physical situation to a model, relationship, calculation and evidence-based conclusion, while using current official documents for exact assessment conditions.
Core concepts
Concept 1
For horizontal launch, the horizontal component has constant velocity when resistance is neglected.
Exam cue: Create separate horizontal and vertical columns with the shared time.
Concept 2
The vertical component accelerates at the local gravitational field strength.
Exam cue: Use velocity-time area for range or height where the graph is supplied.
Concept 3
A satellite orbit is continuous projectile motion in which gravity provides the inward acceleration while horizontal motion prevents impact.
Exam cue: Describe an orbit using both horizontal velocity and weight.
Risk pitfalls and guardrails
Applying vertical acceleration to horizontal velocity.
Guardrail: Choose a direction convention and distinguish signed vector quantities from scalar magnitudes.
Assuming the projectile stops horizontally at its highest point.
Guardrail: Check the model, assumptions, prefixes, units, significant figures and whether every conclusion is supported by evidence.
Saying there is no gravity in orbit.
Guardrail: Check the model, assumptions, prefixes, units, significant figures and whether every conclusion is supported by evidence.
Memory anchors
Horizontal motion
Constant velocity when air resistance is neglected.
Vertical motion
Constant downward acceleration due to gravity.
Shared variable
Horizontal and vertical components have the same time.
Horizontal range
Horizontal velocity multiplied by flight time.
Orbit
Sideways velocity plus continuous gravitational fall.
Orbit force
Weight supplies the inward acceleration.
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
Ignoring air resistance, what happens to horizontal velocity of a launched projectile?
Ignoring air resistance, what happens to vertical velocity?
Answer all questions to submit.
Next step personalized recommendations
Continue learning
Move forward only after this module is stable.
What is Pass Harbor?
Completely free exam prep for 247 UK exams.
- Practice questions
- Flashcards
- Study guides
- Mock exams
- No registration
- No paywall
- Start instantly
“No more expensive exam prep. Quality study tools should be accessible to everyone.”