Chapter 10-forces Flashcards
what two words describe a force
a push or a pull
what units are used to measure the strength of a force
newtons
is kicking a soccer ball a push or a pull?
push
if the net force is 0 will the objects motion change
no because it is balanced
how can you find the net force if two forces act in opposite directions
you subtract
how does the direction of friction compare to the direction of motion
they pull in opposite directions
what are the two properties that determine the strength of the force of friction
how hard the surfaces push together and the type of surfaces involved
4 types of friction:
static, rolling, sliding, fluid
why don’t you notice the pull gravity between most objects
because there pull is small compared to the earth
state Newton’s law of universal gravitation
gravity acts everywhere in the universe
two factors affect the gravitational attraction between two objects:
mass and distance
is there such thing as zero gravity
no
what is the acceleration velocity of an object as it falls to earth
9.8 m/s
fluid friction occurs when
you ride your bike through a puddle
a push or a pull
a force
forces are measured in units called
newtons
__________acting on an object result in a net force and cause a change in the object’s motion
multiple forces
opposite forces act on an object do not
change the object’s motion
when two or more opposite forces cancel each other out
they are balanced
if the effects of the forces don’t cancel out and equal 0
they are unbalanced
a force can be shown with
a vector
what is a vector?
a line with an arrow that begins with a dot.
