Gravitation Fields

Question 1

Equipotential Definition

Answer 1

Imaginary surface in a gravitational field which is the locus of all points with the same potential

Extra - if you put dots above the earth at the same gravitational potential . The equipotential line is connecting up all these dots

Question 2

Gravitational Field Definition

Answer 2

Objects with mass create an invisible disturbance in the space around them that is felt by other massive objects

NKg-1

Question 3

Potential Gradients definition

Answer 3

The change of potential per metre at a point

NKgm-1

Question 4

How are Potential Gradient and Field Strength linked?

Answer 4

g=-v/m

Question 5

Newton’s 3 assumptions

Answer 5

Gravity is;

• Always an attractive force
• Proportional to the product of the two masses
• Inversley proportional to r sqaured

Question 6

Field Definition

Answer 6

An area around an entity or object that can exert an affect on another body by virtue of it being there

Question 7

3 Types of Fields

Answer 7

Gravitational Fields - affect masses placed in them
Electrical Fields - affect electrical charges placed in it
Magnetic Fields - fields that affect magnetic dipoles

Question 8

Newtons law of gravity

Answer 8

All massed exert attractive forces on all other masses. Near the earth this force is almost entirely an attraction to earth so if something is dropped to falls towards the centre of the earth

Question 9

Graviational Potential Definition

Answer 9

The Work done per unit mass to move a small object from infinity to that point