Forces and Newton's Laws Flashcards
What does the assumption “light” mean?
Body has negligible mass
What does “static” mean?
Body is not moving
What does “rough” mean?
Body in contact with the surface will experience a frictional force which opposes motion
What does “smooth” mean?
No frictional force experienced by body
What does “rigid” mean?
Body does not bend
What does “thin” mean?
Negligible thickness
What does a “particle” mean?
Mass acts at a certain point
Dimensions don’t matter
What does “plane” mean?
A flat surface
What does “lamina” mean?
Flat, thin, 2D body
What does “beam” or “rod” mean?
Long, thin, straight, rigid body
What does “wire” mean?
Thin, inexstensible, rigid, light body
What does “string” mean?
Thin, inexstensible, light body
What does “peg” mean?
Fixed support which a body can hang or rest on
What does “pulley” mean?
Fixed and smooth wheel over which a string passes
What is weight?
Weight is a force due to a particles mass
What is the equation for weight?
W = mg
W - weight
m - mass
g - gravitational constant
What is tension?
Force in a taut string, wire, or rod
Prevents two objects from moving further apart
What is thrust/compression?
Force in a rod NOT string
Prevents two objects from moving closer together
What can forces be broken down into?
i and j
vertical and horizontal components
What is newtons first law?
Body will rest or maintain a constant velocity unless a resultant force acts on the body
What is newtons second law?
Overall resultant force acting on a body is equal to the mass of the body multiplied by the body’s acceleration
F = ma
What is newtons third law?
When two bodies are in contact and one exerts a force on another the other exerts a force of the same magnitude in the opposite direction
