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Title: IB Physics Topic 6 Notes
Description: Notes for Topic 6 (Circular Motion) of IB Physics.
Description: Notes for Topic 6 (Circular Motion) of IB Physics.
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6
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Centripidal means centre-seeking
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1 is not changing, but its direction IS
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The equation for the centripidal acceleration is:
The equation for the centripidal force is:
The centripidal force is the net force of an object in circular motion
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Sometimes the period of a revolution is given, rather than a
velocity
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A car rounds a curve with a radius of 100
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The
coefficient of kinetic friction between the tyres and the road is 0
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[3 marks]
a) What is the speed of the car?
b) If the road speed limit is 70 km/hour is the car driving legally?
Topic 6 Page 5
6
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The separation between the sun and a planet is very large compared to their radii, therefore
it applies to them
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The gravitational force is always attractive
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Topic 6 Page 7
Gravitational Field Strength
A mass is said to create a gravitational field in the space around it
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The unit of gravitational field strength is
, which is equivalent to
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The gravitational field strength at a certain point can be defined as the gravitational force per unit mass experienced by a small mass
placed at that point
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on a point mass is
The force experienced by a small point mass
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Therefore, the gravitational field strength is the same as the
Orbital Motion
To maintain a constant circular orbit, there must be no frictional forces
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Simplified:
This gives the speed for a circular orbit of radius
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The period of planets going around the Sun is proportional to the power of the orbit radius
...
Topic 6 Page 9
Title: IB Physics Topic 6 Notes
Description: Notes for Topic 6 (Circular Motion) of IB Physics.
Description: Notes for Topic 6 (Circular Motion) of IB Physics.