Circular Orbits (OCR GCSE Physics A (Gateway Science Suite)): Flashcards
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12 cards from this deck
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Practise the cards
12 cards from this deck
Shape of planetary orbits around the sun
Shape of planetary orbits around the sun
Almost circular
Cause of orbits
Cause of orbits
Force of gravity
Objects that orbit planets
Objects that orbit planets
Moons and artificial satellites
Why velocity changes in circular motion at constant speed
Why velocity changes in circular motion at constant speed
Direction is changing
Definition of velocity
Definition of velocity
Speed and direction
What keeps planets from flying off into space?
What keeps planets from flying off into space?
Force of gravity towards the sun
Two factors causing circular orbital path
Two factors causing circular orbital path
Momentum of object and force of gravity
Why planets maintain constant speed in orbit
Why planets maintain constant speed in orbit
No friction or air resistance in space
How gravitational force varies with distance
How gravitational force varies with distance
Stronger closer to the star/planet
Speed needed when gravitational force is stronger
Speed needed when gravitational force is stronger
Faster to remain in orbit
Effect on orbit radius when speed changes
Effect on orbit radius when speed changes
Radius also changes
Relationship between speed and orbit radius
Relationship between speed and orbit radius
Faster object = smaller radius