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?