Magnets Push and Pull from a Distance
Magnets push and pull from a distance, exerting a non-contact force on magnetic materials and on other magnets without touching them. Every magnet has two poles, a north pole and a south pole, and opposite poles attract while like poles repel. In Grade 3 science with Amplify Science California Grade 3, students investigate magnetic forces and discover that the force acts across empty space, making it fundamentally different from a push or pull made with your hand. This understanding sets the stage for learning about electromagnetic forces in later grades.
Key Concepts
A magnet is a special object with an invisible force. Unlike a hand that must touch a door to push it, a magnet does not have to touch an object to move it. The force reaches across the empty space.
This magnetic force acts as a non contact force. It can pull certain metal objects toward it, or it can push another magnet away, all without any physical contact.
Common Questions
How do magnets push and pull from a distance?
Magnets create a magnetic field that extends through space around them. When a magnetic material or another magnet enters this invisible field, the magnetic force acts on it without any physical contact, pulling it closer or pushing it away.
What are the poles of a magnet?
Every magnet has a north pole and a south pole. Opposite poles attract each other while like poles repel each other.
What materials do magnets attract?
Magnets attract materials that contain iron, nickel, or cobalt. Common magnetic materials include steel paper clips, iron nails, and many refrigerator doors. Materials like plastic, wood, aluminum, and copper are not attracted to magnets.
What is a non-contact force?
A non-contact force can push or pull an object without physically touching it. Magnetic force is a non-contact force because a magnet can attract a paper clip across a small gap of air.
How do 3rd graders learn about magnets?
In Amplify Science Grade 3, students explore how magnets interact with different materials and with each other. They test whether a magnet can act through different materials and measure how distance affects the strength of the magnetic force.
Does the distance between a magnet and an object matter?
Yes. The magnetic force gets weaker as the distance between the magnet and the object increases. Up close, the force is strong enough to attract or repel; at greater distances, the force may be too weak to move the object.