Review Notes for 4-29-15 Flashcards
Define weight
How strong Gravity is pulling on an object (amount of gravitational force)
What type of tool do you use to measure mass? What type of tool do you use to measure weight?
You use a balance for mass and a scale for weight
What unit do you use to measure mass? What about the unit for weight?
You use grams to measure mass and newtons to measure weight
What’s Newton’s first law of motion?
The motion of an object doesn’t change unless a force is applied
Define force
A push or pull on an object
Name the 4 forces gravity is a part of
Gravity, electromagnetism, strong force, and weak force
Is gravity a push or pull?
It only pulls
Where does gravity come from?
Anything that has mass (ex a planet)
What is an object in orbit affected by? (2 things)
1) Inertia pushing it in a straight line
2) Gravity pulling it towards the planet
What are the 3 parts of Einstein’s theory of gravity?
1) Space is like a flexible sheet
2) Objects with mass bend space creating “dimples”
3) Objects inside the same dimple attract one another
What is the strength of gravity affected by? (2 things)
Mass of the objects and the distance between the objects
The closer the objects the ______ gravity
The closer the objects, the more gravity
More mass means _______ gravity
More mass means stronger gravity
Define mass
The amount of matter in an object
