Electric Fields - electric potential and work done

Question 1

Define an Elastic Collision

Answer 1

• When a collision results in NO LOSS in kinetic energy

Question 2

Define an Inelastic Collision

Answer 2

• When a collision results in a LOSS in kinetic energy and a GAIN in thermal or internal energy

Question 3

As you go further from the centre of the charge ….

Answer 3

…. the strength of the charge will decrease.

Question 4

If you move a bigger mass or charge in an electric field, … (energy)

Answer 4

… the energy change will be larger too due to the Work done to the mass/charge.

Question 5

Q1 / Q2 stand for …

Answer 5

… the charges inducing a force on each other.

Question 6

r stands for …

Answer 6

… r stands for the radius from the centre of the source of the charge.

Question 7

k stands for the …

Answer 7

… constant.

Question 8

Where is there the least Electric Potential in an electric field when there are two charges (positive and negative) in a region of space, both having the same electric field coverage/radius and you are a positive charge?

Why?

Answer 8

Nearest to the negative charge.

Because (from a positive charge) you only need a small amount of work done to it, to move it away from the + and towards the - .

Question 9

Where is there the most Electric Potential in an electric field if you are a positive charge?

Why?

Answer 9

Nearest to the positive charge.

Because (from a positive charge) you need a large amount of work done to it, to move it away from the - and towards the + (they repel each other) .

Question 10

V stands for …

Answer 10

… electric potential.

Question 11

F stands for …

Answer 11

… electrostatic force.

Question 12

Unit for V

Answer 12

V or JC^-1

Question 13

Unit for F

Answer 13

N

Question 14

Unit for r

Answer 14

m

Question 15

Unit for Q

Answer 15

C

Question 16

Unit for E

Answer 16

Vm^-1 or NC^-1

Question 17

EPE is the … supplied to the charges.

Answer 17

… energy …

Question 18

In a gravitational field, if an object is moved along an equipotential line, … .

Answer 18

… it doesn’t “do work” against the field (assuming no friction).

Question 19

W stands for …

Answer 19

… work done.

Question 20

Unit for W

Answer 20

J

Question 21

How do you find how close a proton gets towards another proton before being repelled?

Answer 21

↓KE = ↑Potential Energy
1/2 m v^2 = F (idk why)
1/2 m v^2 = k Q1 Q2 / r
k Q1 Q2 / 1/2 m v^2 = r