Forces Move Objects Without Contact
Learn how forces act at a distance without physical contact: magnetism and gravity can push or pull objects and change their motion without touching them, demonstrating non-contact forces.
Key Concepts
A force is a push or a pull that acts on an object, capable of changing its motion (speeding up, slowing down, or turning).
While many forces require physical contact (like friction), others act at a distance .
Common Questions
What are non-contact forces in Grade 8 science?
Non-contact forces like magnetism and gravity exert pushes or pulls without touching objects. A magnet attracts a paper clip across empty space, demonstrating force at a distance.
How does magnetism demonstrate force without contact?
A magnet produces a field that exerts force on magnetic materials even with a gap between them, proving objects can be moved without direct physical contact.
What is the definition of force for 8th graders?
A force is any push or pull that acts on an object and changes its motion — speeding it up, slowing it down, or turning it. Forces can act through contact or at a distance.