mechanics Flashcards
scalar
scalar quantity has magnitude only no direction
vector
vector quantity has both direction and magnitude
distance
length from one point to another
displacement
distance in a certain direction per unit of time
speed
distance travelled per unit of time
rate of change of distance with respect to time
velocity
distance travelled per unit time in a particular direction
acceleration
rate of change of velocity = change in velocity divided by time = m/s squared
mass
the mass of a body is its ability to resist changes in velocity
momentum
product of mass and velocity
newtons first law of motion
an object will remain at constant velocity unless a force acts upon it
newtons second law
when a force acts upon an object the rate of change of momentum is directly proportional to the force acting and takes place in the direction of the force
newtons third law
for every action will have an equal but opposite reaction
force
a force is something that can cause an object to accelerate
weight
the force exerted on a body by the gravity of the earth
one newton
the force which gives a mass of 1kg an acceleration of 1 m/s2
