Mechanics Flashcards
Scalar
A quantity that has magnitude only
Vector definition
A quantity that has magnitude and direction
Displacement definition
Distance moved in a stated direction
Speed
Distance per unit time
Instantaneous speed
Speed at a specific instance in time
Average speed
Distance travelled divided by total time taken
Velocity
Displacement per unit time
Acceleration
Rate of change of velocity
Newton’s first law
Every body continues in state of rest uniform motion in a straight line unless acted on by an external resultant force
Newton’s 2nd law
Rate of change of momentum of a body is directly proportional to the applied resultant force
Newton’s 3rd law
Every force has an equal and opposite force of the same type
Centre of gravity
Where entire weight of an object acts from
Density
Mass per unit volume
Work done
Energy required to move an object through a distance
Conservation of energy
Energy can only be transferred from one form to another not created or destroyed
