2 - Work, energy and Power Flashcards
1
Q
What is the work done formula?
A
Force in direction of motion x distance moved in the direction of the force (J).
2
Q
What is the work done against gravity formula?
A
mgh.
3
Q
What is the kinetic energy equation?
A
1/2mv^2.
4
Q
What is the potential energy equation?
A
mgh (above an arbitrary fixed level).
5
Q
How is work done related to energy?
A
WD = change in KE.
Fs = 1/2mv^2 - 1/2mu^2.
6
Q
What is the principle of conservation of mechanical energy.
A
1/2mv^2 + mgh before = 1/2mv^2 + mgh after.
7
Q
What is the work-energy principle?
A
1/2mv^2b + mghb -WD - WDfr = 1/2mv^”a + mgha (check in book).
8
Q
Define power.
A
Rate of work done.
9
Q
What is the equation for power?
A
P = Fv.
W = J/s.
10
Q
How do you force if there is acceleration?
A
P/v - Whori - Fresi = ma.
