Electrostatic and Gravitational forces (unit 4)

Question 1

Electric field strength?

Answer 1

The force experienced per unit charge by a small positive charge placed in their field.

Question 1

Electric potential?

Answer 1

work done per unit charge in bringing a positive charge from infinity to that point

Question 2

Electric field strength units?

Answer 2

Vm^-1

Question 3

Electric Potential Units?

Answer 3

V

Question 4

Gravitational field strength?

Answer 4

-Force experienced per unit mass by a mass placed in the field

Question 5

Gravitational potential?

Answer 5

-work done per unit mass in bringing a mass form infinity to that point

Question 6

What are equipotential surfaces?

Answer 6

points where there are equal potential energy so circles around a point charge

Question 7

Closest approach?

Answer 7

1/2mv^2=PE

Question 8

Escape Velocity?

Answer 8

1/2mv^2 - GPE = 0

Question 9

What do gravitational field lines represent?

Answer 9

-the direction a stationary mass would initially move

Question 10

What is different to gravitational field and electric field?

Answer 10

• gravitational field only shows attraction

Question 11

What is GPE negative?

Answer 11

-work done by the field moving object from infinity
-potential energy falls as object moves from infinity