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Gravitational fields
| Question | Answer |
|---|---|
| What are the differences between mag and grav fields | Mag: Dipolar, affects only magnetic fields, can alternate/charge Grav: Monopolar, Affects all bodies, Is fixed |
| What is the direction of field and equipotential lines | Field lines- Radial Equipotential lines- Circumferential |
| How can we model the earths gravitational field over small distances | As a uniform field |
| Newtons theory of gravitation assumes that the gravitational force between between any two objects is: | -Always attractive -Proportional to the mass of each object -Proportional to 1/(r^2) where r is the distance apart |
| What is the equation for newtons theory of gravitational | F=-(Gm1m2)/r^2 |
| Define gravitational field strength | The strength of a grav field is the force per unit mass on a small test mass placed in that field |
| What is the unit for gravitational field strength | Nkg^-1 |
| Define gravitational potential | The gravitational potential at a point in a field is the work done in bringing a unit mass from infinity to that point |
| What is the equation for gravitational potential | V=-(GM)/r |
| What is the mass of a planet | m=(v^2)r/G |
| What is the equation for gravitational field strength | g=GM/r^2 |
Created by:
Liam P
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