P8: Forces in balance Flashcards
distance without change of direction is
displacement
what is a vector
a physical quantity that has both size and direction
examples of vectors
acceleration
force
momentum
weight
gravitational field strength
what are scalars
quantities that only have magnitude
examples of scalars
speed
distance
time
mass
energy
power
what can vectors be represented as
arrows
length is magnitude
direction is direction
what is Newton’s third law of motion
when two objects interact with each other, they exert equal and opposite forces on each other
what is the driving force on a car
the force that makes it move
what is a resultant force
a single force that has the same effect as all the forces acting on the object
if the resultant force is 0….
the forces acting on the object are balanced
newtons first law states
an object remains in the same state of motion, unless a resultant force acts on it.
what kind of diagram can we draw to describe multiple forces on an object
free-body force diagram
what is a moment
the turning effect of the force
how can we increase the moment?
-increasing size of force
-increasing the perpendicular distance from pivot
what do we call the weight of an object on a lever
load
what is the force the person applies to a lever called
effort
the point at which the lever turns is called the
pivot
what is the phrase for when the effort moves a bigger load
the force multiplier
the line that a force acts is called its
line of action
