SCI 8 - RETEST Forces and Interactions (electricity & magnetism) 2023

Last updated 2 months ago

11 questions

Note from the author:

Instructions

Required

1

Required

5

1

BASICS - Questions 1-7 (miss < 2 or retest); APPLICATION -  Question 8

BASICS - Questions 1-9 (miss < 2 or retest); APPLICATION -  Question 10 & 11

In electricity, the current flows from to .

North to South

South to North

Positive to Negative

Negative to Positive

How would the gravitational force be impacted if the moon moved closer to the earth?

A) The gravitational force would stay the same.

B) The gravitational force would decrease.

C) There is no gravitational force.

D) The gravitational force would increase.

Categorize ALL the following descriptions under the correct topic for electricity, magnetism or both.

Has charges that flow N to S
Has current that transfers + to -
Quick transfer of charges
Part of an electromagnet
This type of field can be created by the rotation of Earth
Created by aligned domains in an object
Strength of field is affected by size + distance
Non-contact forces
Create fields that can attract or repel
Used in chemical (ionic) bonding

Electricity
Magnetism
Both Electricity & Magnetism

Which types of charges would attract each other? (SELECT ALL THAT APPLY)

A) negative charge to negative charge

B) positive charge to positive charge

C) negative charge to positive charge

D) positive charge to neutral charge

Moving a magnet near a compass can cause the compass needle to move, even though the magnet does not touch the compass. This observation is evidence for which characteristic of magnetic fields?

A) They have a north and a south pole.

B) They can exert a force across a distance.

C) They are constantly changing direction. 

D) They can be generated by electricity.

Students want to investigate how the amount of electric energy delivered to a motor affects its speed. Which of the following procedures will most likely produce the data students need to answer their question?

A) Closely observe the rotation of the motor to see if the direction of spin reverses when the poles of the battery are switched.

B) Add larger and larger motors to a battery to determine the size of the largest motor the battery is able to run.

C) Measure the rotations per second of a motor when it is connected to one battery, two batteries, and three batteries.

D)  Connect a series of motors to the same battery to figure out how many motors can be run off the same battery. 

When the charge of an electromagnet is increased, what happens to the force?

A) The force increases.

B) The force decreases.

C) The force stays the same.

D) There is no force.

This table above shows the magnitude of electromagnetic force exerted by two electromagnets on each other as the distance between the two electromagnets is varied. The data on the table provide evidence for which of the following conclusions?

A)  The smaller the distance between two electromagnets, the greater the force.

B)  As distance between electromagnets increases, the electromagnetic force also increases.

C)  The force between any two magnets is always constant, regardless of distance.

D)  The force between two magnets depends only on the charge of the electromagnets.

The illustration above shows a hand generator. Turning the handle of the generator spins a magnet and creates an electric current that lights the bulb. Which of the following observations can be used to indicate the strength of the current created by the generator?

A)  The length of the wire.

B)  The size of the magnet.

C) The brightness of the bulb.

D)  The mass of the generator.

**Explain how a compass works.

Required

1

**Look at the image and explain what it is and how it works. How could you make it stronger?

In electricity, the current flows from ________ to ________.

North to South

South to North

Positive to Negative

Negative to Positive

How would the gravitational force be impacted if the moon moved closer to the earth?

A) The gravitational force would stay the same.

B) The gravitational force would decrease.

C) There is no gravitational force.

D) The gravitational force would increase.

Categorize ALL the following descriptions under the correct topic for electricity, magnetism or both.

Has charges that flow N to S

Has current that transfers + to -

Quick transfer of charges

Part of an electromagnet

This type of field can be created by the rotation of Earth

Created by aligned domains in an object

Strength of field is affected by size + distance

Non-contact forces

Create fields that can attract or repel

Used in chemical (ionic) bonding

Electricity

Magnetism

Both Electricity & Magnetism

Which types of charges would attract each other? (SELECT ALL THAT APPLY)

A) negative charge to negative charge

B) positive charge to positive charge

C) negative charge to positive charge

D) positive charge to neutral charge

Moving a magnet near a compass can cause the compass needle to move, even though the magnet does not touch the compass. This observation is evidence for which characteristic of magnetic fields? 

A) They have a north and a south pole.

B) They can exert a force across a distance.

C) They are constantly changing direction. 

D) They can be generated by electricity.

Students want to investigate how the amount of electric energy delivered to a motor affects its speed. Which of the following procedures will most likely produce the data students need to answer their question? 

A) Closely observe the rotation of the motor to see if the direction of spin reverses when the poles of the battery are switched.

B) Add larger and larger motors to a battery to determine the size of the largest motor the battery is able to run.

C) Measure the rotations per second of a motor when it is connected to one battery, two batteries, and three batteries.

D)  Connect a series of motors to the same battery to figure out how many motors can be run off the same battery. 

When the charge of an electromagnet is increased, what happens to the force?

A) The force increases.

B) The force decreases.

C) The force stays the same.

D) There is no force.

 This table above shows the magnitude of electromagnetic force exerted by two electromagnets on each other as the distance between the two electromagnets is varied. The data on the table provide evidence for which of the following conclusions? 

A)  The smaller the distance between two electromagnets, the greater the force.

B)  As distance between electromagnets increases, the electromagnetic force also increases.

C)  The force between any two magnets is always constant, regardless of distance.

D)  The force between two magnets depends only on the charge of the electromagnets.

 The illustration above shows a hand generator. Turning the handle of the generator spins a magnet and creates an electric current that lights the bulb. Which of the following observations can be used to indicate the strength of the current created by the generator? 

A)  The length of the wire.

B)  The size of the magnet.

C) The brightness of the bulb.

D)  The mass of the generator.