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IB Physics (HL)
Fields
Topic 10 - Fields
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IB Physics (HL)
Fields
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Gravitational Potential Energy (unit: J)
The work done on a small mass in bringing it from infinity to a point in the gravitational field.
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Gravitational Potential (unit: Jkg-1)
The work done per unit mass on a small mass in bringing it in from infinity to a point in the gravitational field.
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Electric Field Strength (unit: NC-1)
The force per unit charge on a small positive charge at a point in the electric field.
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Electric Potential Energy (unit: J)
The work done on a small positive test charge in bringing it in from infinity to a point in the electric field.
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Electric Potential (unit: JC-1)
The work done per unit charge on a small positive test charge in bringing it in from infinity to a point in the electric field.
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Why is gravitational potential negative?
* Potential is defined to be zero at infinity
* Positive amount of work needs to be supplied for a mass to reach infinity
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Subsequent motion of projectile after fired upwards
* Velocity decreases
* Magnitude of deceleration decreases
* Velocity becomes constant
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Orbital speed decrease, what effects?
* KE will initially decrease → TE decrease
* Earth moves closer to Sun
* New orbit with greater speed
* Change ellipticity of orbit