P5a ‘Satellites and circular
motion’
P5a - What’s in today’s lesson?
• Artificial satellites: low polar and geostationary orbits
• Gravity: How does gravitational force affect objects?
• Circular motion: What keeps things orbiting?
Low polar orbitsWhere?
Time to orbit?
Uses?
Geostationary orbitsWhere?
Time to orbit?
Uses?
Gravitational force
Gravitational force
Strength of gravitational pull between two objects depends on two things:
M1 M2
d
Gravitational force
• So the closer to the
Sun or another planet,
the ________ the
gravitational pull and
the _________ an
object will move
Q ~ Which planet orbits
the sun fastest?
Circular motion (p148)
Centripetal force is…
Why don’t satellites
fall?
Why don’t satellites
fall?
P5a - What was in today’s lesson?
• Artificial satellites: low polar and geostationary orbits
• Gravity: How does gravitational force affect objects?
• Circular motion: What keeps things orbiting?