Mechanics And Materials Flashcards
What is Newton’s first law
An object will remain at rest or travel at a constant velocity until it experience’s a resultant force.
What is Newton’s second law
The acceleration of an object is proportional to the resultant force experienced by the object.
( f = ma )
What is Newton’s third law
For each force experienced by an object, the object exerts an equal and opposite force back
What do elastic collisions preserve
Momentum
Kinetic energy
What do inelastic collisions preserve
Only momentum
Kinetic energy is converted into other forms of energy
What is density
The mass per unit volume.
Used to measure how compact a substance is.
What is tensile stress
The force applied per cross sectional area
What is tensile strain
Tensile strain is the extension over thr original length
What assumptions can be made while using suvat formula
There is no air resistance acting
The object is moving uniformly therefore acceleration is constant
How is a “‘moment” defined
The force multiplied by the distance perpendicular from the line of action of the force to the pivot.
Measured in Nm
What is work done
The transfer of energy from one form to another when a force is moved through a distance.
Measured in jukes
What is impulse
The resultant force of an object multiplied by the length of time it acts for.
Can be measured in Ns or kg ms^-1
What is power
Power is the energy transferred per second or the rate at which work is done.
Measured in Watts (W)
