Coulomb's Law

Physics
Unit 2 Forces- Coulomb's Law

Cycle 3 | Week 1

Multiple Choice

Why can't you ever really touch anything? Watch the video!

• Atoms don't like to mix

• The protons of the individual atoms repel each other

• The electrons of the individual atoms repel each other

• quarks are quirky

Multiple Choice

Which of the 4 fundamental forces, occur within atoms and binds the nucleus together by overcoming repulsive forces of the protons?

• Strong Force

• Weak Force

• Gravity

• Electro-magnetic Force

Multiple Choice

Which of the 4 fundamental forces is not really a force at all, but the inertia of masses traveling across folds in space-time?

• Strong Force

• Weak Force

• Gravity

• Electro-magnetic Force

Multiple Choice

Which correctly pairs the subatomic particles with their charges?

• p = + , e = - , N = 0

• p = - , e = + , N = 0

• p = + , e = 0 , N = -

Multiple Choice

Protons contain two up quarks and one down quark. Which equation describes the proton's overall charge?

• 2/3 + 2/3 - 1/3 = +1

• -1/3 + -1/3 + 2/3 = 0

Multiple Choice

Which equation describes the neutron's overall charge?

• 2/3 + 2/3 - 1/3 = +1

• -1/3 + -1/3 + 2/3 = 0

Multiple Choice

(1) Which pair of subatomic particles will attract each other? (2) Which will repel?

• (1) Protons and electrons

  (2) electrons and electrons

• (1) electrons and electrons

  (2) Protons and electrons

Multiple Choice

Comparing: Which Law depends upon charge and distance between objects?

• Law of Gravity

• Coulomb's Law

• Both

Multiple Choice

Comparing: Which Law depends upon mass and distance between objects?

• Law of Gravity

• Coulomb's Law

• Both

Multiple Choice

Comparing: Which Law depends upon the inverse square law?

• Law of Gravity

• Coulomb's Law

• Both

Multiple Choice

Comparing: Which Law has a very small proportionality constant?

• Law of Gravity

• Coulomb's Law

• Both

Multiple Choice

Comparing: Which Law has a very large proportionality constant?

• Law of Gravity

• Coulomb's Law

• Both

Multiple Choice

Why is the force between two electric point charges so much greater than the gravitational force between two masses?

• It comes down to the proportionality constants.

  k is almost a billion trillion times larger than G

• This is not the right answer.

Multiple Choice

What variable is a Coulomb the unit for?

• Charge

• Force

• Distance

• Mass

Multiple Choice

Find the magnitude of the force between two charges of 1.0 C each which are 1.0 meter apart?

• 9E-9 N

• 9E9 N

• 1.1E10 N

• 1.1E-10 N

Multiple Choice

Which is the value of the constant in Coulomb's equation?

• k = 9·10^-9

• k = 9.8

• k = 6.67·10^-11

• k = 9 ·10⁹

Multiple Choice

The Electric Force is strongest when charges are...

• close together

• far apart

• the electric force is constant everywhere

Multiple Choice

When distance increases, electrostatic force ____________; we call this relationship ____________ proportional

• decreases;directly

• decreases;inversely

• increases;inversely

• increases;directly

Multiple Choice

A balloon is rubbed on a student's head. What occurs because of this?

• Charged particles on the balloon are destroyed

• Positively charged particles move from head to balloon

• Charged particles from the balloon are released into the air

• Negatively charged particles move from head to balloon

Multiple Choice

As two oppositely charged particles approach each other, what happens to the electrical force between them?

• The attractive force increases

• The magnitude of the electric force decreases

• The repulsive force increases

• The magnitude of their charges increases

Multiple Choice

A repulsive force exists between which two particles?

• Two neutrons

• An electron and a neutron

• An electron and a proton

• Two protons

Multiple Choice

Which two particles are attracted to each other?

• Two neutrons

• A proton and an electron

• Two protons

• An electron and a neutron

Multiple Choice

A 5 C and 8 C are 8 m apart. What is the force between them?

• 5.625 x 10⁹

• 5.625 x 10^-9

• 4.5 x 10¹⁰

• 4.5 x 10^-10