Kinetic Energy And Work Flashcards
What is the formula for kinetic energy?
K = ½mv²
What is work in physics?
Work W is energy transferred to or from an object via a force acting on the object.
How is work defined mathematically?
W = Fd cos(θ)
What does the work-kinetic energy theorem state?
The kinetic energy equals the net work done on the particle: ΔK = K_f - K_i = W
What is the formula for work done by gravitational force?
W_g = mgd cos(φ)
How is work done in lifting or lowering an object related to kinetic energy?
ΔK = K_f - K_i = W_a + W_g
What is Hooke’s law for spring force?
F_s = -kx
What is the formula for work done by a spring force?
W_s = ½k(x_f² - x_i²)
How is work done by a variable force calculated?
The work done is found by integrating the force.
What is the formula for average power?
P_avg = W / Δt
What is instantaneous power?
P = dW / dt
What is the formula for power in terms of force and velocity?
P = Fv cos(θ)
