A student is conducting an experiment to determine what will happen to the gravitation force of two boxes, with different masses, if the boxes are pushed together. One box has a mass of 100 g and the other box has a mass of 150 g. What will happen if these two boxes were moved closer together?

• gravitational force would remain constant

• gravitational force would not be created

• gravitational force would decrease

• gravitational force would increase

Tags

NGSS.MS-PS2-4

The image depicts two bar magnets immersed in oil that contains small needle-like particles of iron. What is the BEST interpretation of the pattern created by the iron particles?

• The pattern of iron particles is created by the north pole of one magnet facing the south pole of the other magnet.

• The pattern of iron particles is created by the south pole of one magnet facing the south pole of the other magnet because south poles attract each other.

• The pattern of iron particles is created by the repulsion of like magnetic poles, we cannot determine if the poles are north or south polarization.

• The pattern of iron particles is created by the north pole of one magnet facing the north pole of the other magnet because north poles attract each other.

Tags

NGSS.MS-PS2-3

NGSS.MS-PS2-5

Carlos and Kenneth are making an electromagnet for their Science project. What will be the BEST core to make the strongest electromagnet and why?

• A pencil because it is an insulator.

• An iron stake because it is a conductor.

• A battery because it provides electricity.

• A copper wire because it provides low resistance.

A student makes a generator and a motor to compare how they work. Which argument would help you explain the difference between a generator and a motor?

• A. A generator converts magnetic force into electricity and a motor converts magnetic force into mechanical energy. Both are affected by how often the coils of wire rotate.

• B. A generator converts mechanical energy into electricity and a motor converts magnetic force into mechanical energy. Both are affected by the strength of the battery and magnets.

• C. A generator converts mechanical energy into electricity and a motor converts electricity into mechanical energy. Both are affected by the strength of the magnets and number of wire coils used.

• D. A generator converts electricity into mechanical energy and a motor converts mechanical energy into electricity. Both are affected by the strength of the magnets and number of wire coils used.

You and your sister both have a small camping tent set up in the backyard. You each have two strings of lights to hang inside the tent. You power your lights with a 9-volt battery and your sister uses an extension cord and powers her lights from an electrical outlet on the deck. What is the BEST conclusion the you can make about this situation?

• Your lights shine the brightest because your battery produces less power.

• Your lights shine the brightest because your battery produces more power.

• Your sister’s lights shine the brightest because the electrical outlet has less power.

• Your sister’s lights shine the brightest because the electrical outlet has more power.

A group of students have built an electromagnet using a 9-volt battery, an iron nail, and copper wire. How can they make the magnet stronger?

• increase the length of the nail

• increase the size of the battery

• increase the voltage of the battery

• increase the diameter of the wire used to make the coil

Tags

NGSS.MS-PS2-3

How do the falling rocks support the claim that a gravitational field exists between objects that are not in contact?

• The larger rock is falling toward the Earth faster than the smaller rocks showing that a uniform gravitational field exists between the Earth and objects moving toward the Earth.

• The rocks are falling toward the Earth at the same rate showing that a uniform gravitational field exists between the Earth and objects moving toward the Earth.

• The smaller rocks are falling toward the Earth faster than the larger rock showing that a uniform gravitational field exists between the Earth and objects moving toward the Earth.

• The rocks are falling toward the Earth at the same rate showing all objects are influenced by the same amount of force as they are falling toward the Earth.

Tags

NGSS.MS-PS2-4

NGSS.MS-PS2-5

The image depicts two bar magnets immersed in oil that contains small needle-like particles of iron. What is the BEST interpretation of the pattern created by the iron particles?

• The pattern of iron particles is created by the north pole of one magnet facing the south pole of the other magnet.

• The pattern of iron particles is created by opposite poles of the two magnets attracting each other.

• The pattern of iron particles is created by the south pole of one magnet facing the south pole of the other magnet because only south poles attract each other.

• The pattern of iron particles is created by the repulsion of like magnetic poles, we cannot determine if the poles are north or south polarization.

Tags

NGSS.MS-PS2-3

NGSS.MS-PS2-5

A student fashions an electromagnet from a coil of wire and an iron nail. Why must the wire be connected to the battery for the magnet to work?

• The battery supplies charges to the coil.

• The battery supplies electrons to the coil.

• The battery removes charges from the coil.

• The battery removes electrons from the coil.

Tags

NGSS.MS-PS2-3

NGSS.MS-PS3-5

A group of students built an electromagnet using a 9-volt battery, an iron nail and copper wire. What can the students do to make the electromagnet stronger?

• Increase the thickness of wire used.

• Replace the iron nail with a smaller iron nail.

• Decrease the number of turns in the wire coil.

• Replace the battery with a higher voltage battery.

Tags

NGSS.MS-ETS1-1

NGSS.MS-ETS1-2