motion and forces pt 2 Flashcards
what force is measured in
newtons
the total force that results from adding all of the individual forces acting on an object
net force
forced acting in the same direction are _________ together
added
forces acting in the opposite direction are ____________
subtracted
force that oppose notion between two molecules that are touching
friction
friction always acts in a direction _________ to motion
opposite
name the 4 types of friction
- ) rolling
- ) sliding
- ) fluid
- ) static
type of friction that occurs in liquids and gases
fluid
type of friction that occurs between objects that are not moving
static
substance applied to a surface in order to reduce friction
lubricant
force of attraction between all objects
Gravity
name the two rules of gravity
more mass=more gravity
farther=less gravity
measure of the amount of matter in an object
mass
does not change with location
mass
measure of the force of gravity on an object
weight
will change with location
weight
objects accelerate toward the earth at what rate (g)?
9.8m/sec/sec
air resistance _______ as speed increases
increases
when the upward force of air resistance equals the downward force of gravity and the object stops accelerating. it does not stop falling
terminal velocity
occurs when gravity is the only force acting on an object
free fall
a curved part that an object follows when thrown near the surface of the earth
projectile motion
name the two types of projectile motion
horizontal
vertical
an object at rest will remain at rest and an object in motion will remain in motion( at a constant velocity, unless acted upon by an unbalanced force. also known as inertia
Newton’s first law
the acceleration of an object depends on the mass of the object and the amount of force applied to the object
Newton’s second law
for every action there is an equal and opposite reaction
Newton’s third law
property of a moving object that depends on the object’s mass and velocity
momentum
momentum can be __________ between objects
transferred
if one object gains momentum, then other objects in the group must ______ an equal amount
lose
the total momentum of the group remains the same unless acted upon by an __________ force
unbalanced
a push or pull that gives energy to an object
force
