Forces Flashcards
is force a scalar or vector quantity
vector quantity
what unit are forces measured in
Newtons (N)
how do you show direction in diagrams
using arrows
newton’s first law
in the absence of unbalanced forces, a body will remain at rest, or if moving will continue to move in a straight liner at a constant velocity
what will an object do if the forces on it are balanced
- if an object is moving it will continue to move at a steady speed
2.m if the object is not moving it will continue to remain at rest
what will an object do if the forces on it are unbalanced
- speed up
- slow down
- change direction
a change of velocity is known as ___________
acceleration
newton’s second law
the acceleration of an object is inversely proportional to its mass, directly proportional to the resultant force on it and takes place in the same direction as the unbalanced force
resultant force
the combined effect of all the forces on an object is called the resultant force
newton’s 3rd law
'’every action force has an equal and opposite reaction force’’
friction is a force that _________________________
opposes motion
friction is meaured in
newtons
what is friction useful for
Walking, breaking
what is friction a nuisance in
drag, air resistance
mass
the amount of matter in an object
weight
a force due to the pull of gravity on the object
is mass a scalar or vector quantity
scalar
is weight a scalar or vector quantity
vector
unit of mass
kg
unit of weight
newtons (N)
does mass ever change
no
can the value of weight change
yes depending on the pull of gravity
formula of weight
w=mg
/__W__\
/M|G\
what happens if there is no gravitational force
objects because weightless but they still have a mass
how do objects fall in the absence of air resistance
they all fall at the same rate
(10m/s2)
how can air resistance be effected by area and speed
area- the bigger the surface area of an object the bigger the air resistance
speed- as speed increases air resistance increases
