Magnets & Electricity Part 1: Magnetism

​Science Root of the Day:

DO NOW: Write what you think the example words mean in your lab manual.

Extra Credit: Find three additional words that use this root and write them and their definition in your lab manual (6 Points Max)

Home

Open in new tab

Copy link

Multiple Choice

What is a force?

• A touch

• Any push or pull

• Power or energy

• Gravity only

Multiple Choice

On a graph, which axis shows the dependent variable?

• x-axis
• y-axis
• neither
• it changes

Multiple Choice

a force that opposes motion between any surfaces that are touching

• velocity
• friction
• inertia
• position

Multiple Choice

The graph shows Timmy's distance he is as he leaves school one afternoon. What most likely happens in section B?

• Timmy is walking back to school because he forgot his math book.

• Timmy is talking to a friend and not walking.

• Timmy is walking faster home.

• Timmy is dancing in the street.

Multiple Choice

The SI unit for force

• distance
• Newton (N)
• frame of reference
• inertia

Multiple Choice

Two factors impacting the strength of the force of gravity between 2 objects are...

• mass and distance 
• mass and matter
• distance and weight 
• weight and mass

Magnets Part 1: Magnetic Force

Lesson Objectives

• Establish the attraction-repulsion rule for magnetic poles

• Relate magnetic-field strength to magnetic field patterns

• Show how the relative direction, field, and motion of charged particles affect the force on those particles

What is a Magnet?

• Magnet: Any material that attracts iron and materials that contain iron

  • Can vary in size

• Ancient Greeks discovered a rock called magnetite, which could attract iron and repel other magnetite rocks.

• Magnetism: the attraction or repulsion of magnetic Materials

  • Most Magnets show the same properties of Magnetite

What makes a Magnet a Magnet?

• Magnets do three things

  • Attract iron and materials that contain iron

  • Magnets can attract or repel other magnets

  • If allowed to swing freely, one end of the magnet will always point north

What are Magnetic Poles?

• Each magnet has two ends, regardless of the size or shape of the magnet

• Magnetic Pole: The area of the magnet where the magnetic effect is strongest

  • Two types of Poles exist, one at each end of the magnet

    • North Pole: Points North

    • South Pole: Points South

Magnetic Force

• Magnetic Force: the attraction or repulsion between magnetic poles

  • Can cause an object to move

  • It is affected by the distance between the magnets

• Can be used to make high-speed vehicles

How do Magnets Interact?

• When two magnets come together, how they behave depends on how the poles are arranged

• Rule of Magnetic Attraction:

  • Like Poles Repel, Opposite Poles Attract

• Magnetic Poles cannot be isolated

  • If you break a magnet in half, you will wind up two magnets with both poles

Multiple Choice

Two South Magnetic Poles brought near each other

• repel each other

• attract each other

• cancel each other out

• magnetize each other

Multiple Choice

Two North Magnetic Poles brought near each other

• repel each other

• attract each other

• cancel each other out

• magnetize each other

Multiple Choice

A North Magnetic Pole brought near a south magnetic pole

• Nullifies the south pole

• Attracts the south pole

• Repels the south pole

• Magnetizes the south pole

Multiple Choice

Which of the following is not a property of Magnets?

• One end always points north if allowed to move freely

• Can Attract other magnets

• Can Repel other magnets

• Can attract iron

• Repels Copper

What is a Magnetic Field?

• While the magnetic force is strongest at the poles of a magnet, it also exists in other areas of the magnet

• Magnetic Field: the area of magnetic force around a magnet

  • Allows magnets to interact without touching

  • Can be formed from only one magnet

Magnetic Field Lines

• Magnetic Field Lines Map out the invisible Magnetic field around a magnet

  • They spread out from one pole, curve around, and return to the other pole

    • Form a complete Loop from pole to pole

  • Lines always leave from the North end of the pole and return to the South

  • The closer the lines are, the stronger the magnetic field

Earth's Magnetic Field

• The Earth behaves just like a giant magnet, with a north and south magnetic pole

  • Causes a compass to always point North

• The core of the Earth contains large amounts of liquid iron in motion due to convection currents

  • These currents help create the magnetic field of the planet

Earth's Magnetic Poles

• Earth has a North Magnetic pole and a South Magnetic pole

• They are not the same as the geographical North and South Poles

  • Magnetic Declination: the angle found between the geographic poles of the Earth and the Magnetic Poles of the Earth

• The magnetic poles shift and move with the convection currents in the core

Multiple Choice

True or False: Magnets can interact without touching

• True

• False

Multiple Choice

​Why does the top magnet float above the bottom magnet?

• The magnets are made of different materials.

• The like poles repel each other.

• The opposite poles repel each other.

• the magnets have different gravitational pull

Multiple Choice

True or False: Magnetic field lines always cross each other

• True

• False

Multiple Choice

True or False: Earth's Magnetic Poles are not located in the same place as the geographic poles

• True

• False

Multiple Choice

What creates the Earth's Magnetic Field?

• Convection Currents in the Earth

• The iron on the tops of mountains

• The electrons from lightning

• Buildings made of magnetite