Forces Flashcards
What is axiom 1?
A force considered to act on any point of its line of action
What is the first axiom known as?
Principle of Transmissibility
What is axiom 2?
Forces intersecting is equivalent to a resultant force
What is Newtons second law of motion?
The rate of change of momentum is directly proportional to the force
What are conditions in static systems?
v = 0 and sum of forces = 0
Why are free body diagrams helpful?
- Simplifies the analysis of mechanical system
- A body is isolated from all other bodies in the system
What is friction?
- The 2nd direction component of the reaction force
- Friction is the force that prevents layers of fluid, surfaces of solids and material components sliding against one another.
What is the coulomb friction?
Coulomb friction is a simplified quantification of the friction force that exists between two dry surfaces in contact with each other
How is limiting friction denoted?
P < mu x W
How do gravitational forces act?
Attraction only
How do magnetic forces act?
Attraction or repulsion
How electrostatic forces act?
Attraction or repulsion
What is the Reynolds number?
- Dimensionless quantity
- Is used to determine the type of flow pattern as laminar or turbulent while flowing through a pipe
What is the definition of static equilibrium?
Any system that obeys Newton’s laws of motion with the conditions that it does not accelerate and has zero velocity is said to be in static equilibrium
How can you tell if a force system is in equilibrium?
When the forces make an enclosed shape
