Part-2. Measurement of the Coefficient of Kinetic-Friction 1 -Weigh the wooden f
ID: 1790252 • Letter: P
Question
Part-2. Measurement of the Coefficient of Kinetic-Friction 1 -Weigh the wooden friction-block record its mass mp in kg. Replace the cart with the friction-block and put a 0.5-kg bar on the block. Adjust the string to be horizontal to the track again. Put the felt face of the block down in contact with the track. 2- To find the value of the coefficient of kinetic friction, a, between the block and the track. Add mass to the hanger until the friction-block accelerates on the track. Record value of the mass of the hanger m, for this acceleration. Determine the acceleration, a, of the block from the slope of the velocity versus time graph , coefficient a2 N = mb g, Calculate the coefficient of kinetic-friction ux for your set-up from above e 3- Determin and the track. quation. e the energy dissipated as heat, by the friction force between the felted block 4 - Make a table of three columns; () for work done by falling weight (W); l) for change in kinetic energy of the system(block + hanger) (KE.); and (III), work done against the friction force, or energy dissipated as heat by friction-w-(K.EJ. CART SMART PULLEY WOODEN CLAMP CLAMP Mass Hase uestions 1-From Part-1, if the work-done by the falling hange r is kept constant, what would be the effect on the final velocity of the cart if its mass is increased? inal velocitY becomes esseoecavst mes rcrase 2 - From Part-2, what would be the effects of increasing the the friction force, and on the energy dissipated as heat?Explanation / Answer
1.
since the work done by the falling hanger is constant, the kinetic energy gained by cart also remains same . as the mass is increased , the speed decreases to keep the kinetic energy constant
2.
frictional force depends directly on the normal force between the two surfaces in contact. as the mass of sliding block is increased, the normal force increases and hence the frictional force increase.
energy dissipated as heat directly depends on the frictional force magnitude. since the frictional force increases on increasing the mass of sliding block , the energy dissipated increases too.