8.3 Forces at a Distance

When 2 objects make contact,

• they both apply a force on each other

• only the one in motion applies a force

• only the one at rest applies a force

• neither one applies a force

Tags

NGSS.MS-PS2-1

When 2 objects collide, the strength of these forces is ____________ and _____________ in direction.

• equal and opposite

• uneven and opposite

• equal and the same

• uneven and the same

Tags

NGSS.MS-PS2-1

A junkyard crane uses an electromagnet to lift scrap iron. Which of the following statements in NOT true when the crane is lifting the iron?

• The magnetic field of the copper coil repels the scrap iron.

• The magnetic field of the copper coil attracts the scrap iron.

• Electric current flows through a copper coil in the electromagnet.

• The crane is providing an electric current.

Tags

NGSS.MS-PS2-3

A magnet can repel..

• another magnet.

• objects made of iron.

• objects made of copper.

• nothing, magnets only attract.

Tags

NGSS.MS-PS2-3

NGSS.MS-PS2-5

How is the audio device (computer or phone) different from a battery?

• The electric current can change directions.

• The electric current cannot change directions.

• It does not provide an electric current.

• They are not different.

What type of metal is pulled by magnets?

• iron

• copper

• aluminum

• none of these

Placing two magnets so that OPPOSITE poles are facing will change the magnetic field shape so that there will be ______________ forces between them.

• attractive

• repulsive

• neutral

• none of the answers are correct

Tags

NGSS.MS-PS2-3

NGSS.MS-PS2-5

Placing two magnets so that LIKE poles are facing will change the magnetic field shape so that there will be ___________ forces between them.

• attractive

• repulsive

• neutral

• none of the answers are correct

When we disconnect the copper coil from the battery, then we will observe that...

• the coil will not attract or repel a permanent magnet.

• the coil will attract or repel a permanent magnet.

• the coil will attract to iron and magnets, but it won't repel iron.

• the coil will attract or repel iron and magnets.

Tags

NGSS.MS-PS2-3

NGSS.MS-PS2-5

A student writes the hypothesis, "When we bring another piece of iron near the doorbell's hammer arm, then we will observe no forces between them if the doorbell's hammer arm is made of iron,." What is the EFFECT?

• "the doorbell's hammer arm is made of iron"

• "bring another piece of iron near the doorbell's hammer arm"

• "no forces between them"

• None of the answers are correct.

Tags

NGSS.MS-PS2-5