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# Physics SemesterExam

### semester A examination

acceleration the rate at which velocity is changing. (includes direction)
acceleration equation a= change in V / change in T
air resistance diminishes net forces acting on an object.
elastic collision when objects come together and bounce off of each other
inelastic collistion when to objects interact and stay attached to each other after the collision.
component the projection of a vector quantity, as force or velocity, along an axis.
constant
dependent variable the part of data that can be changed in an experiment
direction the place where an object is going.
displacement includes direction the change in position of an object
the equation for displacement x final -x intial
distance the space between two places or object.
units for distance meters (m)
duration how long something lasts
elliptical referring to an oval shaped curve that is the path of a point that moves such that the sum of its distances from two fixed points is contant
energy the property of an object of system that enables to do work
unit for evergy Joules (J)
force an influence that accelerates an object using a push or a pull, also a vector quantity
units for force Newtons (N)
free fall motion under the influence of the gravitational force only
friction the force that acts to resists the relative motion (or attempted motion) of objects or materials that are in contact
gravitational field force a force field that exists in the space around every mass or group of masses.
horizontally left to right, right to left
hypothesis an educated guess before an experiemt
impluse product of force and time interval during which the force acts.
momentum change equals impluse *
independent variable the part of an equation that cannot change ex:percentages
initial first, starting
joules the unit for work and all forms of energy
kilogram unit of mass (kg)
kinetic something in motion
kinetic energy energy in motion
equation for kinetic energy 1/2mass(speed^2)
law of conservation of momentum in the absence of a net force, the momentum of an obeject of system is unchanged.
magnitude a measurement without direction(how big,long,ect.)
mass a measurement of ones inertia and how much matter an object has.
momenta plural of momentum
momentum the product of mass and velocity of an object has magnintude and direction (vector quantity)
net force the combination of all forces action on an object
net impulse
newtons is used for unit for force
normal force for an object resting on a horizontal surface, the upward force that balances the weight of an object. (aka supporting force)
potential energy energy the has the potential to create kenetic energy. ex: rollercoaster at top of hill
equation for potential energy mass(gravity)height
projectile any object that moves through the air or space, acted only by gravity, can be air resistance
power rate at which work is done or energy is transformed.
equation for power P= Work/time
radius from the center of a circle to the outside
resistance going against
scientific notation a number times 10 to the power of something (negative= decimal, positive=positive) ex: 2.4 x 10^4 = 24,000
static
vectors an arrow whose length represents the magnitude of a quantity and whose direction represents the direction of the quantity
velocity speed together with the direction of motion
vertically up and down
volume space that occupies an object.
weight the force on a body due to gravity
work the product of the force on an object and the distance through which the object is moved.
work is measure in Joules W= Force (distance)
Y intercept the place on a graph where x=0
newtons 1st law a force will remain constant unless acted upon an outside force
newtons second law F=ma law
newtons 3rd law each force has an equal an opposite force
Created by: Ylimeli