A7 Work, Energy, and Power

what is energy?

the capacity to do work

what is the unit for energy?

joules

when work is being done in the same direction as displacement, its value is...

positive

when work is being done in the opposite direction as displacement, its value is...

negative

1 joule is equal to...

1 newton meter

what is the formula for energy or work?

force * displacement

what is the unit for force?

newton

what is the unit for displacement?

meters

what is the formula for kinetic energy in terms of mass and velocity? (put everything in parentheses)

(1/2)(m)(v^2)

what is the first fundamental equation in proof for the kinetic energy formula? (only involves force)

acceleration = force / mass

what is the second fundamental equation in proof for kinetic energy formula? (assume from point A to B, and x is displacement)

(vb^2)-(va^2)=2ax

the work-kinetic energy theorem states that ___ = ____,

net work = change in kinetic energy

what is another formula for maximum height in terms of work?

y = (v^2)/(2g)

in a conservative force, the work done depends on the _____, not the _____

displacement, path

what are the two mechanical forms of potential energy?

gravitational and spring

what is the formula for work in terms of springs?

1/2k(xb^2)-1/2k(xa^2)

an object has potential energy when…

it can release energy when released from a position

what is the formula for potential energy of a spring?

1/2kx²