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Questions and Answers
What kind of forces are spring force, gravitational force, and Coulomb force?
What kind of forces are spring force, gravitational force, and Coulomb force?
- Centripetal forces
- Conservative forces (correct)
- Frictional forces
- Non-conservative forces
What is the dependence of both gravitational force and Coulomb force on distance?
What is the dependence of both gravitational force and Coulomb force on distance?
- Linear
- Inverse-square (correct)
- Exponential
- Cubic
What happens to the sum of kinetic and potential energies for a body when the external force is removed?
What happens to the sum of kinetic and potential energies for a body when the external force is removed?
- It increases
- It remains constant (correct)
- It decreases
- It becomes zero
What can be defined for a charge in an electrostatic field similar to the potential energy of a mass in a gravitational field?
What can be defined for a charge in an electrostatic field similar to the potential energy of a mass in a gravitational field?
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When can a test charge be brought from a point R to a point P against the repulsive force due to a charge Q?
When can a test charge be brought from a point R to a point P against the repulsive force due to a charge Q?
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Study Notes
Types of Forces
- Spring force, gravitational force, and Coulomb force are examples of conservative forces.
Distance Dependence of Forces
- Gravitational force and Coulomb force both depend on the inverse square of the distance between objects.
Energy Conservation
- When an external force is removed, the sum of kinetic and potential energies for a body remains constant.
Electrostatic Potential Energy
- Electrostatic potential energy can be defined for a charge in an electrostatic field, similar to the potential energy of a mass in a gravitational field.
Test Charge Movement
- A test charge can be brought from a point R to a point P against the repulsive force due to a charge Q when the work done in moving the test charge is equal to the difference in electrostatic potential energy between the two points.
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