Flashcards in Work/Energy Deck (22):
What is the equation for impulse?
What is Work?
Means by which energy is transferred (units= Joules)
What is Energy?
The ability to do work
What is the equation for work?
What is Impulse?
Product of force and time; proportional to the product of mass and velocity
What does the area of a force vs displacement graph represent?
What is Power?
Rate at which work is done; expressed as number of Joules per second or Watts (W)
What is the equation for power?
P=W/t or P=F(d/t) or P=Fv
What is Kinetic Energy?
Energy an object has by being in motion relative to a frame of reference
What is the equation for Kinetic Energy?
What is Potential Energy?
Stored energy related to the position of an object in a frame of reference
What is the equation for potential energy?
What is the Work-Energy Theorem?
Work done by the sum of all forces acting on an object is equal to the change in that object's kinetic energy; W=ΔKe and W=ΔPe
In the absence of frictional forces, total mechanical energy is _______________.
Conserved; equal before and after the motion; ΔPe=ΔKe or mgh=1/2mv^2
What is Mechanical Energy?
Sum of potential energy and kinetic energy; total energy of an object/system
What is a Conservative Force?
Work done by an object is is independent from the path it takes; mechanical energy is conserved and remains constant with time
What is a Nonconservative Force?
Work done by an object is not independent from the path it takes
What is an example of a nonconservative force?
Friction or Air Resistance
What is the equation for nonconservative forces?
What is the equation for conservation of a spring?
In what circumstance is there no work even though there is force?
The force is not parallel to the motion; the force is perpendicular to the motion