10.4 Electric Forces and Free-Body Diagrams

• Coulomb's Law describes the electric force between two charged objects
• The net electric force on a charge due to multiple charges is the vector sum of the individual forces exerted by each charge.

  True
• Coulomb's Law states that the electric force between two point charges is inversely proportional to the square of the distance
• The Principle of Superposition states that the net electric force on a charge due to multiple charges is the vector sum of the individual forces exerted by each charge.


  True
• What is the value of Coulomb's constant in SI units?

  8.99 \times 10^{9}</latex>
• In an example where a positive charge is at the origin, with two other charges to its right, what is the net force on the positive charge?

  Vector sum of forces
• The Principle of Superposition for Electric Forces states that the net electric force on a charge is the vector sum of individual forces.


  True
• Coulomb's Law applies to two charges.
• What is a free-body diagram used for?

  Graphical representation of forces
• Match the type of force with its description:

  Repulsive ↔️ Directed away from the other charge

  Attractive ↔️ Directed toward the other charge
• If two charges have opposite signs, the force between them is attractive.


  True
• The vector sum of all electric forces on a charge in equilibrium must be zero.


  True
• A free-body diagram is a graphical representation of all the forces acting on an object
• What does Coulomb's Law focus on?

  Magnitude of force
• In a free-body diagram, the direction of a force indicates whether it is attractive or repulsive.
• What formula is used to calculate the magnitude of electric force in Coulomb's Law?

  $F =$$k \frac{|q_{1} q_{2}|}{r^{2}}$
• If two charges have the same sign, the force between them is repulsive.
• To analyze equilibrium, free-body diagrams are used to represent the electric forces acting on a charge.
• What is the formula for Coulomb's Law?

  $F =$$k \frac{q_{1} q_{2}}{r^{2}}$
• Match the variable in Coulomb's Law with its meaning:

  $q_{1}$ ↔️ Charge of first object

  $q_{2}$ ↔️ Charge of second object

  $r$ ↔️ Distance between charges

  $k$ ↔️ Coulomb's constant
• The mathematical representation of the Principle of Superposition is $\vec{F}_{net}$
• Match the variable in Coulomb's Law with its unit:

  $F$ ↔️ Newtons (N)

  $q$ ↔️ Coulombs (C)

  $r$ ↔️ Meters (m)

  $k$ ↔️ $N⋅m^{2} / C^{2}$
• What is the principle of superposition in electrostatics?

  Vector sum of forces
• The net force on a charge is the vector sum of individual forces acting on it.


  True
• What does the length of a force vector represent in a free-body diagram?

  Strength of the force
• The electric force between two charges is 0.6 N.
• What is the net electric force on a charge in equilibrium?

  Zero