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Physics semester final
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Gravity
Terms in this set (42)
physics
The study of matter and energy and the interactions between the two through forces and motion.
terminal velocity
the constant velocity of a falling object when the force of air resistance is equal in magnitude and opposite in direction to the force of gravity
Percision
the exactness of a measurement
Accuracy
how close a measurement is to the true value
Displacement
the change in position of an object
Acceleration
The rate at which velocity changes
Parabola
u shape of an object projected through the air
projectile
an object that is thrown or propelled
Trajectory
the curved path of an object thrown into space
centripetal force
a force that acts on a body moving in a circular path and is directed toward the center around which the body is moving.
centripetal acceleration
acceleration toward the center of a curved or circular path
centrifugal force
an apparent force that acts outward on a body moving around a center, arising from the body's inertia.
Inetia
The tendency of an object to resist a change in motion
vertical velocity
speed that changes as it travels in projectile motion
Dynamics
the branch of mechanics concerned with the motion of bodies under the action of forces.
Kinematics
the branch of mechanics concerned with the motion of objects without reference to the forces that cause the motion.
Four universal forces
strong nuclear, electromagnetic, weak nuclear, and gravitational
Newton's First Law
Law of Inertia object in motion tends to stay in motion
Newton's Second Law
F=ma acceleration of an object is directly proportional to the net force and inversely proportional to mass
Newton's Third Law
For every action there is an equal and opposite reaction
Weight
A measure of the force of gravity on an object
Mass
the amount of matter in an object
static friction
Friction that acts on objects that are not moving
kinetic friction
the force that opposes the movement of two surfaces that are in contact and are moving over each other
Force normal
force perpendicular to the surface
Inetia
The tendency of an object to resist a change in motion
Equilibrium
net force =0
Impulse
change in momentum
elastic collision
A collision in which colliding objects rebound without lasting deformation or the generation of heat.
inelastic collision
A collision in which the colliding objects become distorted, generate heat, and possibly stick together.
Law of conversation of momentum
The rule that in the absence of outside forces the total momentum of objects that interact does not change.
Scalar
A physical quantity that has magnitude only.
Vector
A quantity that has magnitude and direction
Resultant
the sum of two or more vectors
Distance
How far an object moves
Displacement
the change in position of an object
concurrent forces
two or more forces must act on a common point but must pull or push in different directions
Speed
distance/time
Velocity
Speed in a given direction
Equalibriant
a force which brings a body into mechanical equilibrium. According to Newton's second law, a body has zero acceleration when the vector sum of all the forces acting upon it is zero
vector resolution
the process of breaking a vector into its perpendicular component vectors
magnitude
Greatness of size, strength, or importance
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