1. Which law gives the force between two objects that is related to their mass and distance?
A. Newton's law of gravitation
B. Coulomb's law
C. Kepler's law
D. Newton's second law of motion
2. What is the property that allows a positive proton and a negative electron to feel an attraction between each other?
A. Mass
B. Charge
C. Spin
D. Weight
3. In which case would there be an electrostatic force between two objects?
A. two neutral objects
B. a negatively charged object and a neutral object
C. two positively charged objects
D. a positively charged object and a neutral object
4. Which statement is correct about the electronstatic force?
A. It depends on the mass of the charge
B. It can have a positive or negative value
C. It is independent of the distance between charges
D. It is only observed between two electrons
5. In the simulation, the two charges are both set to +4 μC. Then one of the charges is changed to −4 μC. Which statement describes the situation?
A. The electostatic force changes from attractice to repulsive.
B. The electrostatic force is originally attractice and stays attractive.
C. The electostatic force is originally repulsive and stays repulsive.
D. The electostatic force changes from repulsive to attractive.
1. A
2. B
3. B
4. C
5. D