W5D3 POTENTIAL & MORE POTENTIAL

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There is still one unidentified clicker. Whoever this is will not be receiving any clicker points. W5D3 POTENTIAL & MORE POTENTIAL. PLEASE TURN IN PART I OF THE WORKSHEET. Let’s Discuss the last Worksheet. Electric Potential I. Work and Potential Difference. A.

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## W5D3 POTENTIAL & MORE POTENTIAL

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Presentation Transcript

There is still one

unidentified clicker.

Whoever this is will

not be receiving any

clicker points.

### W5D3 POTENTIAL & MORE POTENTIAL

PART I OF

THE WORKSHEET

Let’s Discuss the last Worksheet

Electric Potential

I. Work and Potential Difference

A

Work and Potential Difference
• An object travels from point A to point B while two constant forces of equal magnitude, and , are exerted on it. Think about the work done by each force and the net work.
• Is the work done on the object by F1positive, negative, or zero?
• A Positive
• B Negative
• C Zero

B

A

Work and Potential Difference
• An object travels from point A to point B while two constant forces of equal magnitude, and , are exerted on it. Think about the work done by each force and the net work.
• Is the work done on the object by F2positive, negative, or zero?
• A Positive
• B Negative
• C Zero

B

A

Work and Potential Difference
• An object travels from point A to point B while two constant forces of equal magnitude, and , are exerted on it. Think about the work done by each force and the net work.
• Is the work done on the object by the net force positive, negative, or zero?
• A Positive
• B Negative
• C Zero

B

A

Work and Potential Difference
• An object travels from point A to point B while two constant forces of equal magnitude, and , are exerted on it. Think about the work done by each force and the net work.
• Is the magnitude of the velocity of the object at point B greater than, less than, or equal to the velocity of the object at point A? Explain how you can tell.
• A Positive
• B Negative
• C Zero

B

A

Work and Potential Difference
• An object travels from point A to point B while two constant forces of equal magnitude, and , are exerted on it. Think about the work done by each force and the net work.
• Which, if any, of your responses to questions 1, 2, 3, or 4 would change if the magnitude of F1was twice as great as the magnitude of F2?

B

Quick Summary
• If the net force on an object is zero but it is moving from Point A to Point B, it is in equilibrium and is moving at constant velocity.
• If the net force on this object is NOT zero, then it is accelerating and gaining energy (Kinetic).
• In the absence of any other forces, the net work done by these forces is equal to the change in kinetic energy + the change in potential energy.
• REMEBER: PE=qV
• UNITS OF V is VOLTS. (Big surprise).
Consider the following:

DEFINITION

+Q

D

-Q

UNIFORM ELECTRIC FIELD

E

Area = A

s=Q/A

A Capacitor is a device like the above that STORES CHARGE.

There is a potential difference between these two plates. (V)

The capacitance C is equal to the charge/potential difference.

C=Q/V Q=CV

Consider the following:

+Q

D

-Q

UNIFORM ELECTRIC FIELD

E

Area = A

s=Q/A

Work needed to move unit charge from A to B also is (magnitude, anyway) FxD=ED (unit charge)

So .. What does it all mean??

The capacitance of a parallel plate

capacitor depends only on geometrical

factors.

NOT on charge or potential difference!

Interesting??

Resistors and Inductors Do The Same Thing.

WORKSHEETS – Electric Potential

Part II

&

then

Part III

&

maybe

Part IV or V