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Summary AQA AS/A Level Physics A* Revision Notes: Gravitational & Electric fields £4.76   Add to cart
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Summary AQA AS/A Level Physics A* Revision Notes: Gravitational & Electric fields

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Achieve an A* in your A Level Physics exams with our expertly written notes on 'Electric and Gravitational Fields'. Created by a student who scored an A*, these notes are clear and easy to understand. Delve into the principles of electric fields and gravitational fields, exploring topics such as fi...

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  • July 28, 2024
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3.7. Fields

Force field def.?
- a region in which a body experiences a non-contact force
- consists of vectors

~gravitational fields~

Define field lines?




Diff ways of creating a force field?
- by the interaction of masses → gravitational field
- by the interaction of static charges → electric field
- by the interaction of moving charges → electric field
Gravity def.?
- a universal attractive force acting between all matter
- its magnitude can be calculated using:




where G = gravitational constant and:




What does Newton’s law of gravitation assume?
~the grav. force between any two point objects is:




- say instead = proportional to the PRODUCT of their masses
⇒ hence the equation

,Equation of F being an inverse square law?




What does g stand for?
- gravitational field strength
‘g’ def.?



- g = F/m only applies to small masses placed in a gravitational field of a large mass →
otherwise:



How can Newton’s law of gravitation be used to determine g of a grav. field?
- the grav. field strength at any point in the field of a planet/any spherical mass
⇒ so for radial fields ONLY
- how to derive it:




(remember: r is radial distance from the CENTRE of the spherical mass)
Radial field def.?
- field lines are directed towards the centre of a sphere
→ the magnitude of g decreases with increasing radial distance away from the large body
Uniform field def.?
- g is same in magnitude and direction throughout the field

, Derive g inside a planet?

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