Year 1 Mechanics Flashcards
What is a vector quantity
A quantity that has both magnitude and direction
e.g. displacement
What is a scalar quantity
A quantity that has magnitude
e.g. speed
What is the modelling assumption for a particles
Mass of object is concentrated at a single point
Rotational forces and air resistance can be ignored
What is the modelling assumption for a rod
Mass is concentrated along a line
No thickness
Rigid
What is the modelling assumption for a lamina
Mass is distributed across a flat surface and no thickness
What is the modelling assumption for a uniform body
Mass of the object is concentrated at a single point at the geometrical centre of the body
What is the modelling assumption for a light object
Treat object as having no mass
Tension the same at both ends of a light string
What is the modelling assumption for a inextensible string
Acceleration is the same in objects connected by a taut inextensible string
What is the modelling assumption for a smooth surface
No friction
What is the modelling assumption for a rough surface
Friction present
What is the modelling assumption for a wire
Treated as one dimensional
What is the modelling assumption for a smooth and light pulley
Pulley has no mass
Tension is the same on either side of the pulley
What is the modelling assumption for a bead
Moves freely along a wire or string
Tension is the same on either side of the bead
What is the modelling assumption for a peg
Dimensionless and fixed
What are the 5 SUVAT equations
V = U + AT
S= (U+V /2)T
V2 = U2 + 2AS
S = UT + 1/2AT2
S = VT -1/2AT2