Electric Fields - electric potential and work done Flashcards

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1
Q

Define an Elastic Collision

A
  • When a collision results in NO LOSS in kinetic energy
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2
Q

Define an Inelastic Collision

A
  • When a collision results in a LOSS in kinetic energy and a GAIN in thermal or internal energy
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3
Q

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

A

…. the strength of the charge will decrease.

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4
Q

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

A

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

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5
Q

Q1 / Q2 stand for …

A

… the charges inducing a force on each other.

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6
Q

r stands for …

A

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

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7
Q

k stands for the …

A

… constant.

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8
Q

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?

A

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 - .

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9
Q

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

Why?

A

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) .

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10
Q

V stands for …

A

… electric potential.

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11
Q

F stands for …

A

… electrostatic force.

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12
Q

Unit for V

A

V or JC^-1

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13
Q

Unit for F

A

N

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14
Q

Unit for r

A

m

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15
Q

Unit for Q

A

C

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16
Q

Unit for E

A

Vm^-1 or NC^-1

17
Q

EPE is the … supplied to the charges.

A

… energy …

18
Q

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

A

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

19
Q

W stands for …

A

… work done.

20
Q

Unit for W

A

J

21
Q

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

A

↓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