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EXSC 362 Midterm 1 Hunter BYU
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Gravity
Terms in this set (39)
normal force
the force perpendicular to the object
friction
force acting in the opposite direction of an object
weight
mass of the object under the influence of gravity
mass
measure of inertia
resultant force
final force after considering all other forces
equilibrium
when all forces are equal
inertia
measurement to a change in motion
dynamic friction
when two forces are sliding between each other.
static friction
when an object stops moving
rolling friction
force acting when object is rolling
kinematics
branch of dynamics with linear motion
distance
length traveled on a straight or curved path
displacement
straight line distance between start and finish
speed
distance divided by change in time
velocity
displacement over change in time
acceleration
change in velocity over time
rectilinear
motion in a straight line with no change in orientation
curvilinear
motion on a curved path with no change in orientation
angular
rotation of all points on an object around an axis
general motion
any combo of two or more motions
curved acceleration
if an object is traveling along a curved path, there is always acceleration pointed in the direction of the axis of rotation even if the speed is constant
projectile
an object set in motion and only having gravity work on it
Newton's 1st Law
Law of inertia. An object will stay at rest or stay in motion until it is acted upon by another force.
Newton's 2nd Law
F=ma. The force is made in the direction of the straight line.
Newton's 3rd law
Equal and opposite reaction
When is momentum conserved?
if the net external force is at equilibirum, then the total system momentum is conserved
linear momentum
product of mass and velocity
elastic collision
all the energy is conserved
inelastic collision
objects collide and stay together and no energy is conserved
coefficient of restitution
ratio of speeds before and after collisions
mechanical work
product of force and displacement. in joules
kinetic energy
the energy of a moving object. Joules
gravitational energy
energy of an object based on position
strain energy
stiffness and deformation
power
rate of doing work
Conservation of energy
energy is conserved if only gravity is the force.
mechanical energy
ability to perform work
positive vs negative work
positive when the force applied on the object is in the same direction
how do weight and inertia affect movement?
inertia affects any object affected by gravity.
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