Unit 1.0: Force Field

Question 1

What is force?

Answer 1

Force is a external cause. It can push or pull objects without coming in contact with them. It can make a object in rest, go in motion, and one in motion, go to rest. The object moves/stops in the driection force is applied.

Question 2

What is static electricity?

Answer 2

The build-up of excess positive or negative charge in an object. The object that accepts electrons becomes negatively charged while the object giving out electrons becomes positively charged. The object will keep the excess charge until it comes in contact or close to another object.

Question 3

What are the properties of charges?

Answer 3

Like charges repel
Unlike charges attract

Question 4

What is Charging by conduction?

Answer 4

The flow of charged particles that takes place when two objects are touching.

Question 5

What is charging by induction?

Answer 5

The flow of charged particles when two object are close together. During electrical induction the ends close together will have opposite charge.

Question 6

What is lightning and how does it occur?

Answer 6

Lightning is a white dazzling light you see in the sky. It occurs because during a storm electric charge build up in a cloud. The top of the cloud has positive electrons while the bottom has negative electrons. The negative electrons in the cloud are attracted to the positive electrons in the grounds causing lightning. This is induction.

Question 7

Explain the magnetic field across a conductor and a wire around it?

Answer 7

A conductor gets magnetized when the wire around it has electricity running through it. The conductor has the most magnetism closer to the wire. The magnetic field lines vary depending on the shape of the conductor

Question 8

What is current electricity?

Answer 8

flow of electric charges. It can’t flow through gaps in its path,

Question 9

What is static discharge?

Answer 9

The flow of charge

Question 10

What are rigid bodies?

Answer 10

Bodies that are unchanged when force is applied

Question 11

What are non-rigid bodies?

Answer 11

Bodies that will be in motion when force is applied

Question 12

What are magnets?

Answer 12

Substances that contain minerals are made magnetic by the earth’s magnetic field. They are derived from the word magnesia. A magnetic field is an area around a magnet where its magnetic properties take place. Lodestone is a natural magnet. Poles (North and south) have the most magnetic power. Unlike poles attract and like poles repel.

Question 13

What is induced magnetism?

Answer 13

The temporary magnetism is acquired by a magnetic material when it is kept near a magnet.

Question 14

What are the properties of Magnetic field lines?

Answer 14

1. Magnetic field lines are closed and continuous curves.
2. Outside the magnet they are directed from north to south pole
3. They never intercept one other
4. They are crowded near poles of magnet where the magnetic field is strong
5. They are parallel and have an equal distance between one other
6. They behave like stretched elastic rubber strings

Question 15

What is a permanent magnet?

Answer 15

It is an object that keeps its magnetism after it has been magnetized. They can be natural magnets.

Question 16

What is a compass?

Answer 16

A compass is an instrument used to determine geographic direction on Earth. It has a free-swinging magnetized needle that points north and south.

Question 17

What is an electromagnet?

Answer 17

It is a temporary strong magnet made from a piece of soft iron when current flows around the coil loomed around it. It is an artificial magnet

Question 18

What are the ways of increasing the magnetic field strength of an electromagnet?

Answer 18

1. By increasing the number of copper windings around the soft iron
2. By increasing the amount of current passing through the solenoid

Question 19

Compare electromagnets and permanent magnets

Answer 19

1. Electromagnets are made of soft iron
   Permanent magnets are made of steel
2. The magnetic field strength of an electromagnet can be changed
   The magnetic field strength of a permanent magnet cannot be changed
3. The polarity of an electromagnet can be reversed
   The polarity of a permanent magnet cannot be reversed
4. An electromagnet can easily be demagnetized
   A permanent magnet cannot easily be demagnetized

Question 20

Describe how the earth acts like a magnet.

Answer 20

Earth has a magnetic field around it called the magnetosphere. It has north and south poles but they aren’t in the same place as the geographic north and south. Earth’s poles keep changing over time. Earth’s magnetosphere protects organisms on earth because it stops solar radiation and solar winds. The northern lights or the aurora borealis are caused because of the earth’s magnetosphere.