2.2.1 Mechanics- Statics Flashcards
What is the definition of distance?
A length between two points.
What is the definition of speed?
The rate of change of distance in a given time regardless of direction.
What is the definition of velocity?
The rate of change of distance in a given time in a specified direction.
What is the definition of acceleration?
A rate of change of velocity.
What is the definition of weight?
The weight of a body is the gravitational force with which the body experiences.
What is the formula of force?
Mass x acceleration
What is the definition of a newton?
The force that gives 1kg an acceleration of 1 m/s.
What is the definition of kilogram force?
Magnitude of force exerted on 1 kilo of mass x gravity.
What is the formula of weight (kgf)?
mass x local value of gravity divided by 9.0865
Where is the weight of a body concentrated at?
Centre of gravity.
What happens to forms that are hollow with their centre of gravity?
It may occur in space and provides a convenient point from which to make calculations.
If a force goes through the centre of gravity what happens?
It remains balanced.
What happens if the force acts away from the centre of gravity i.e. the wing tip?
It produces a turning effect.
What is the formula for moment (Nm)?
Force (n) x Distance (m)
What is a clockwise moment?
Movement in a clockwise direction.
What is the moment if the distance is 4m and the force is 5Nm?
20Nm.
What is the equilibrium of translation?
The forces in one direction must equal the forces in the other.
What are quantities thought of as being?
Scalar or Vector.
What is a scalar quantity?
Contains magnitude only.
What are examples of scalar quantities?
Mass, time, temperature, lenghth etc.
What is important about the presentation of scalar quantities?
They are only represented graphically.
What is a vector quantity?
They posses magnitude and direction and if either changes then the vector changes.
What are examples of vector quantities?
Force, velocity and any quantity formed from these.
How is a vector quantity represented?
A line drawn to some scale, representing magnitude at an angle to a datum which indicates the the direction, an arrow showing the way the quantity is applied.