Vocab
Force
A push or pull.
How many laws are there?
3
What is a force?
A push or pull.
What does it mean if an object is stable?
1. it's not moving / no motion.
2. Newtons add up to be 0.
3. Vectors are equal.
What is a fair investigation?
An investigation or experiment in which the variables are carefully chosen.
Constant Motion
An object which is not accelerating constant motion can mean no motion, or motion that is not changing in speed or motion.
What does Newton's first law state?
An object at rest will remain at rest unless acted upon by an outside force.
Is gravity a force? if so, what kind?
Yes, it is a pull.
What does it mean if an object isn't stable?
1. There is motion / it's moving.
2. Newtons don't add up to be 0.
3. Vectors aren't equal.
What is the variable / condition to be investigated?
The independent variable.
Standard of Comparison
Something used to judge or measure against (in an investigation
What does Newton's third law state?
Every action has an equal and opposite reaction.
Yes, it is a push.
As a ball is kicked into the air, is it stable or unstable?
Unstable because there is motion.
What is criteria?
Something that would be nice to have.
Dependent Variable
The measured results of the investigation. "This is the variable that depends on what I changed."
A ball is stable until it is kicked by a person. What law would represent this?
o o o ------ o o
Each blob is pulling with 50N, is this stable? If not, which way is it going and by how much?
Unstable, moving left by 50N.
----------> <------
Is this stable or unstable?
It is unstable because the vector arrows aren't equal.
What are constraints?
Must haves.
Independent Variable
Variable / condition chosen to be investigated. "What I decide to change or test."
What is an example of inertia?
When a bus suddenly stops moving and people inside fall forward.
O o o O o o o o --------- o o O O O O
Each blob pulls with 50N, big blobs pull with 100N. Is this stable or not? If not, by how much is it being pulled to which side?
It is stable and not moving, the newtons adds up to 0.
As two objects collide, are they stable or unstable?
Unstable.
Bob needs food that...
A. Needs to be edible.
B. Prefers good looking food.
C. Has to be under $25.
D. Nice if it's a dessert.
What are the criteria and constraints?
Criteria - B, D
Constraints - A, C