gravity and astrophysics Flashcards
1
Q
what is a ‘field’
A
a representation of how forces and potential energies change in a region of space
2
Q
what causes a magnetic force
A
the interaction between charges that have relative motion between them
3
Q
what causes a gravitational force
A
the interaction between two masses
4
Q
what causes an electrostatic force
A
the interaction between two charges
5
Q
how is a diagram drawn to represent a gravitational force
A
the point mass is represented as a circle,
arrows are drawn spread uniformly around the point mass pointing towards its centre (because gravity is an attractive force),
the lines show the force affecting another point mass
