Exam 8 Target 3 Retake Preap
.
- 1.Gravitational force and electrical force are alike in what ways?
- A.
A. They depend on charge.
- B.
B. They are field forces.
- C.
C. They act only when objects are touching.
- D.
D. They depend on mass.
- 2.Which of the choices below best represent a difference between electric force and gravitational force?
- A.
A. Electric force is inversely proportional to the square of the distance between objects.
- B.
B. Gravitational force is stronger than electric force.
- C.
C. Electric force can both attract and repel.
- D.
D. Gravitational force exists between objects that are not touching.
- 3.Which of the following is not true for both gravitational and electric forces?
- A.
A. Forces are either attractive or repulsive.
- B.
B. The inverse square distance law applies.
- C.
C. Forces are proportional to physical properties.
- D.
D. Potential energy is a function of distance of separation.
- 4.Two 3 kg spheres each carry a charge of magnitude 3 C. How does FE, the strength of the electric force between the spheres, compare with FG, the strength of their gravitational attraction?
- A.
A. FE > FG
- B.
B. FE < FG
- C.
C. FE = FG
- D.
D. If the charges on the spheres are of the same sign, then FE > FG ; but if the charges on the spheres are of opposite sign, then FE < FG.
- E.
E. Cannot be determined without knowing the distance between the spheres
- 5.When comparing the force of attraction between an electron and a proton due to the electric force and gravity, it can be concluded that
- A.
A. the gravitational force is a lot stronger
- B.
B. the electric force is a lot stronger
- C.
C. the two types of forces are the same
- D.
D. they cannot be compared
- E.
E. the electric force is slightly stronger
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