The total work done on the particle is equal to the change in its kinetic energy.?

Question

(a)Always
(b)Only if the forces acting on the body are conservative
(c)Only if the forces acting on the body are gravitational
(d)Only if the forces acting on the body are elastic

Answer 1

d)
otherwise some of work transforms to heat which is potential energy not kinetic.
for example when you kick the wall, acting forces are not elastic and do not rise kinetic energy of your feet or wall.

Answer 2

D.

work done on particle changes internal energy which comprises kinetic and potential energy. the only option that removes the potential energy term is the statement that particle collisions are elastic. otherwise, work done will never be equal to change in kinetic energy alone.

Answer 3

please read work-energy theorem u can understand this question well . in this situation work done on the particle is always equal to change in its kinetic energy okay so option a) always is correct.

Answer 4

quantity of paintings mandatory to end electron is (-)W1 If v decreases to ¼v, the quantity of KE gained is a million/sixteen of W1 .....( by using fact of v² ) finished potential mandatory is = W1 + W/sixteen = W( a million+ a million/sixteen) ... = 17/sixteen W1 = (-) a million.0625 W1 To positioned up above If W1 grew to become into, say 100J of KE, then 100J of paintings must be achieved (one way or yet another) - against the action to deliver the object to relax. From relax, the object has to re-earnings an quantity of KE .... so the completed potential mandatory is going to be greater suitable than 100J (W1) ....... 15/sixteen W1 is under W1. the further KE to be gained will merely be a million/sixteen of W1 by using fact the hot velocity is now a million/4 of it is unique fee .... and KE is proportional to v² ...ie ( a million/4 ² = a million/sixteen ) all the potential standards (to end and to go backwards) must be further at the same time regardless of direction - they are all 'to boot to one yet another') potential is replaced as a effect of doing paintings.... and the quantity of potential replaced is comparable to the quantity of paintings achieved (or vice versa) - it somewhat is the paintings-potential 'theorem'. the two paintings and potential are measured in Joules to enable this. The minus sign isn't mandatory, I used it to point that this paintings grew to become into to be achieved interior the choice direction to the unique action. desire it somewhat is useful RB