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Work and change in kinetic energy - Physics Forums The net work done by all forces acting on an object equals the change in the object's kinetic energy: W_ {net} = \Delta KE Forces can be either conservative (that is, they have a potential energy associated with them) or non-conservative (that is, they don't have a potential energy associated with them)
Why is the net work done equal to the change in K. E. only? Why is it so that the net work done by a force on an object is equal to change in kinetic energy only and not any other form of energy like potential energy? Also is the work energy theorem valid for both conservative and non conservative forces
Momentum and net external force - Physics Forums The Attempt at a Solution For the firecracker problem, I believe the only net external force is gravity Therefore using, Fnet * delta t = delta p Change in momentum is 12 kg * m s Thus, the final momentum of the system is zero Is this reasoning correct? Please let me know of any errors in my reasoning Thank you
What exactly does the Work-Energy theorem say? - Physics Forums Thanks Delta 2 that's very helpful :) Just a question View attachment 283194 So this one always for nonconservative forces or all forces? and the other equation just for conservative forces? This is for the work of all forces, conservative and non conservative
Work Energy Theorem: Delta K Calculation for Particle Moving in x Direction A particle moving in the x direction is being acted upon by a net force F (x)=Cx^2, for some constant C The particle moves from x initial =L to x final=3L What is Delta K, the change in kinetic energy of the particle during that time? I tried thih by doing the integral of F (x), replacing x with 2L (because final-initial, 3L-L)
Work, Net work, Work done by friction - Physics Forums W_ {nc} = \Delta KE + \Delta PE, so for the same book example being lifted at constant velocity, then W_ {nc} = \Delta PE , implying the work done by you is mgh, same result Combining these 2 important equations, it should be evident that W_c = - \Delta PE, or in your example, the work done by gravity is -mgh
Calculating Total Resistance in a Circuit: Delta - Physics Forums The problem with a wye-delta transform is that you are transforming the resistor in question, the 14 ohm resistor will no longer be 14 ohms and it's current will be different You will get a solution to the equivalent network, and the currents in the branches outside of the delta will be correct
Conceptually understanding change in potential energy with 0 net work So the total energy conservation equation becomes which is expected because the net force must be zero To understand your question better, consider the case when the system is only the object In this case, two external forces act on the system and do work that crosses the system boundary, gravity and hand
Net force as a function of time? - Physics Forums All I've done so far is think about F_net Since F=ma, and a is a vector, I was thinking that I should find the x and y components of a and then try to calculate F_net that way, but I'm confused as to where I should use x (t) and y (t) Or instead, thinking about it as the change in momentum over time as delta (mv) delta (t)