VCE Together Year 12 Physics: Gravitational and Electrical Fields about a Point Mass or Charge

#### Physics

• How do things move without contact?
• How are fields used to move electrical energy?
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# Gravitational and Electrical Fields about a Point Mass or Charge

In this lesson on Gravitational and Electrical Fields about a Point Mass or Charge, which is part of Unit 3 Area of Study 1 for VCE Physics, you will learn about them with reference to:

• the direction of the field
• the shape of the field
• the use of the inverse square law to determine the magnitude of the field
• potential energy changes (qualitative) associated with a point mass or charge moving in the field

## Gravitational Field Strength at any Point

Newton’s law of gravitation, states that any particle of matter in the universe attracts any other with a force varying directly as the product of the masses and inversely as the square of the distance between them.

So let’s learn to apply Newton’s law of gravitation to:

• Predict the gravitational field strength at any point in a gravitational field
• Predict the gravitational field strength on the surface of a planet

Gravitational Field follows this equation:

g = \frac{GM} {r^2}
• g is the gravitational field strength
• G is the gravitational constant
• M is the mass of the plant

Gravitational field strength is:

• Proportional to the mass of the orbital body.
• Inversely proportional to the radius squared

### Electric Field, Electric Field Strength and Electrical Potential Energy

This video will provide definitions of electric field, charge and potential.

### Static Electricity

Looking for more resources on concepts aside from Gravitational and Electrical Fields? Check out more of our VCE Physics resources here!

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