Forces
What is a non-contact force?
A force that acts between objects without them touching
What are the names of the two magnetic poles?
North and South
True or false: Electric forces are an example of non-contact forces. Explain your answer.
True — electric forces act at a distance (e.g., static electricity pulling small bits of paper).
Fill in the blank: A _____ is a push or a pull that can cause an object to move.
Force
Which non-contact force pulls objects toward the center of the Earth?
Gravity
What happens when the north pole of one magnet is placed near the south pole of another magnet?
They attract each other
Give one everyday example of an electric force acting without contact (one-sentence).
Example: A balloon rubbed on hair can attract small pieces of paper.
Fill in the blank: Gravity is a _____ force that pulls objects toward the ground without touching them.
Non-contact
Explain what happens to the strength of a non-contact force as objects move farther apart.
The strength decreases as objects move farther apart
If you push two magnets close together and they push away from each other, what is this called? Why does it happen?
Repulsion — like poles repel because the magnetic field lines push the magnets apart (simple student explanation).
How is an electric force similar to gravity and magnetic force? Give one similarity.
Similarity: All can act without direct contact and can either attract or repel (depending on type).
Fill in the blanks: A magnet has two _____ called north and south. Opposite magnetic poles _____ each other, while like poles _____ each other.
Poles, attract, repel
Give two examples of forces that are NOT non-contact forces (i.e., contact forces) and briefly describe when they act.
Friction (when two surfaces rub), Tension (pulling on a rope), Normal force (table pushing up on a book) — any two with short descriptions accepted.
What would happen if you put a piece of paper between two magnets that attract each other? Explain whether the magnets still affect one another.
The magnets would still attract through the paper (paper is not magnetic and is thin so magnetic force passes through).
Describe an experiment that demonstrates static electric attraction.
Simple demo: Rub a balloon on hair to charge it, then hold near small paper bits — they are attracted.
Gravity and magnetism are examples of _____ forces that transfer _____. (two words)
non-contact; energy
Read this situation and identify all forces acting on the object: A book sits on a table; a student lifts the book and drops it. Describe which forces act while the book is on the table, while the student is lifting it, and while it falls.
On table: gravity pulls down, table exerts an upward normal force (forces balance so book stays at rest). While lifting: applied force upward from student plus gravity downward (net upward acceleration while lifting). While falling: gravity downward is the main force (and air resistance small); book accelerates downward.
Draw (or describe) a simple experiment to show that magnetic force can act through some materials. Explain what students should observe and why.
Explain why electric forces can both attract and repel.
Because objects can have opposite or like charges: opposite charges attract, like charges repel. Example: Two balloons charged the same way will push away from each other.
Define, in your own words, the word "repel" and give a short example involving magnets.
Repel = push away. Example: Two north poles of magnets push away from each other.