Gravity and Friction test
Gravity and Friction Notes
Key concepts
What are some contact forces and some non-contact forces?
What is the law of universal gravitation?
What goes up must come down.
How does friction affect the motion of two objects sliding past each other?
Two forces rubbing together cause friction.
Types of forces
What is force?
A push or pull on an object that can change its motion, shape, or direction
Contact force
A push or a pull on the object by another that is touching it
Noncontact force
A force that one object can apply to another object without touching it
What is gravity
What is Gravity
An attractive force that exists between all objects that have mass
The law of universal Gravitation
“Every object in the universe attracts every other object with a force that depends on two things:
How much mass the objects have
How far apart they are”
What does all this mean?
All objects pull on each other with gravity - not just big ones like Earth. Even you and your pencil pull on each other; you just don't feel it, because it's a small force.
More mass = stronger its gravity
Closer objects are to another = Stronger force of gravity is between them
If the moon were closer to Earth, Earth would exert a stronger gravitational pull on it.
Vocab
Mass: The amount of matter in an object
Weight: The gravitational force exerted on an object
Friction: A force that resists the motion of two surfaces that are touching
The Law: Goda order in creation
Newton's law tells us:
“Every object in the universe attracts every other object with a force that depends on their mass and the distance between them
This law reveals a deep order and harmony in creation. It shows that the universe operates under consistent rules, not chaos or randomness
From a Christian perspective, this points to a wise and orderly creator—a God who “created the heavens and the earth” and sustains them with perfect precision.
Conclusion
Just as God’s love holds us spiritually, his gravity holds the universe physically