Engineering Mechanics- An Introduction Flashcards
What is the unit of mass?
Kilograms (kg)
What is the force of gravity (used in Engineering Studies)?
10m/s^2
Other words that imply force?
Force = Load = Push = Pull = Tension = Thrust = Weight
What are scalar quantities?
Only have magnitude (or size). and do NOT have direction.
What are vector quantities?
Have both magnitude (or size) and direction.
In a diagram, the following components are shown by what features:
Magnitude, Sense, Direction, Point of Application
Magnitude = the given force.
Sense = shown by arrow (of the force).
Direction = shown by the angle off the horizontal axis.
Point of Application = where the vector acts.
Concurrent forces are?
Forces all meeting at the one point; forces all intersect at some point.
Co-planar forces are?
Forces acting in the same plane; forces applied to the same surface.
Co-linear forces are?
Forces acting along the same line.
How are vector forces added?
By drawing to scale.
How are vector forces subtracted?
Adding the opposite sense vector.
What is the resultant?
The ONE force which takes the place of ALL other forces and has the same total effect; sum of all forces.
What is the equilibriant?
The force which is EQUAL but has an OPPOSITE sense to the resultant. This force neutralises the effect of all forces acting.
What are rectangular components of a force?
The horizontal and vertical components of a force.
The principle of transmissibility of forces states…
that forces can act anywhere along the line of action of the force and have the same effect, i.e. strongest person is a tug-o-war match will have the same effect regardless if positioned at the back, middle or front.
