forces Flashcards
what is a scalar quantity
have magnitude only
what is a vector quantity
has magnitude and direction
how is a vector quantity represented
by an arrow
what does the arrow of a vector quantity represent
length shows the magnitude
direction shows the direction of the vector
what is the resultant force
a single force that has the same effect as all of the original forces acting together on the object
how do you calculate the resultant of two forces that act in a straight line
by adding their sizes together
how is acceleration related to the resultant force
acceleration of an object is proportional to the resultant force acting on the object
how is the acceleration of an object related to the mass of the object
invesersley proportional
how do you work out the resultant force (equation)
mass x acceleration
f = ma
how do you work out the moment of a force
force x distance
m = fd
how do you work out the momentum
mass x velocity
p = mv
how do you work out stopping distance
thinking distance + braking distance
how do you work out the force
spring constant x extension
f = ke
how do you work out the weight
mass x gravitational field strength
w = mg
how do you work out acceleration
change in velocity / time
a = (v-u) / t
