Card Set Information
What is Newton's first law?
The Law of inertia: an object at rest remains at rest and an object in motion remains in motion unless a force is applied
What is Newton's second law?
Acceleration of object is directly proportional to the net force acting on it
ΣF = ma
Sum of forces = mass x acceleration
VERY IMPORTANT EQ
What is Newton's third law?
When one object exerts a force on another the second object ALWAYS exerts a force on the first object that is equal in magnitude, but opposite in direction
What is inertia? Mass? Weight?
: resistance to a change in motion
Inertia = Forces / Mass
: measure of the inertia of an object
(the force of gravity) = mg
What is a Newton?
The unit of force
kg x m / s
In a force diagram acting on a pull system with two boxes, what are the forces?
There is no x motion for either, so the only forces acting are
Remember that T is the same for both boxes
Also remember that direction of acceleration determines +/- values! (one side up will be + and the other side down with be +)
For an incline plane with no friction, what is the normal force? Acceleration?
Static and kinetic friction info
: opposes force on object and prevents movement. The value can vary based on force applied.
: friction during movement, does not change and is not dependent on speed.
Note - μ
typically less than μ
Note - friction ALWAYS opposes velocity
For an incline plane with friction, what is the normal force? Acceleration?
= g(sinθ + μ