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***=My Answers
1.Where do the forces that make atoms interact come from?
A)from the electric fields of charged molecules
B)from the electric fields of charged subatomic particles***
C)from the electric fields of neutral molecules
D)from the electric fields of neutral subatomic particles
2.When two charged particles are moving toward each other, their velocities decrease until they eventually come to a stop. What happens afterward?
A)They remain in the same place without moving.
B)They accelerate in opposite directions.***
C)They accelerate toward each other.
D)They bond and accelerate together.
3.A bar magnet is held in place while another bar magnet is placed near it. The second bar magnet spins around and attaches to the first magnet on one end. Which statement is correct about the energy stored in the magnetic field?
A)The decrease in the energy stored in the system is proportional to the decrease in kinetic energy.
B)The decrease in the energy stored in the system is proportional to the increase in kinetic energy. ***
C)The increase in the energy stored in the system is proportional to the increase in kinetic energy.
D)The increase in the energy stored in the system is proportional to the decrease in kinetic energy.
4.Which of the following factors would decrease the magnetic field strength of an electromagnet?
A)using an iron core or nail
B)increasing the distances between the turns of the coil***
C)increasing the number of turns in the coil of wire
D)increasing the current or using a higher-voltage power source
5.A student is collecting data about the transfer of kinetic energy using a pitcher of lemonade. She uses the following procedure in one of the trials of her experiment:
Measure the temperature of the lemonade without ice.
Add 10 ice cubes to the pitcher.
Which step should be next in the procedure?
A)Add more ice cubes to the lemonade.
B)Measure the temperature of the lemonade after the ice has melted.***
C)Determine the mass of the lemonade with the ice.
D)Set a timer and find out how long it takes for the lemonade to get cold.
6.Ice melts in water, while remaining at 0 degrees Celsius. Which energy changes occur as it melts?
A)The potential energy of the molecules will increase, and the kinetic energy stays the same.
B)Both the kinetic and potential energy will increase.***
C)Both the kinetic and potential energy will remain the same.
D)The kinetic energy of the molecules will increase, and the potential energy remains the same.
7.Compare conduction to radiation in terms of heat transfer.
A)Both methods require contact between objects, but only conduction helps to evenly distribute energy.
B)Both methods help to evenly distribute energy, but only conduction requires contact between objects.***
C)Both methods help to evenly distribute energy, but only radiation requires contact between objects.
D)Both methods require contact between objects, but only radiation helps to evenly distribute energy.
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