Find average friction?
As shown on the figure, a bead of mass 15 g slides on an wire. The speed of the bead at point A is 6 m/s. After travelling a distance of 250 cm from point A to point the C, the bead stops at point C. What is the average friction experience by the bead in travelling from point A to point C.
As shown on the figure, a bead of mass 15 g slides on an wire. The speed of the bead at point A is 6 m/s. After travelling a distance of 250 cm from point A to point the C, the bead stops at point C. What is the average friction experience by the bead in travelling from point A to point C.
2 Answers
Average Frictional Force = 0.126 N
Explanation:
Frictional losses cause an energy loss = Loss of KE + Loss of PE
Work done by friction = F(fr) distance = m a d
Loss of KE = 1/2 m v^2 = 1/2 .015 6^2 = 0.27 Joules
Loss of PE = m g (change in height) = .015 9.8 0.3 = .0441 Joules
d = 250 cm = 2.5 m
Frictional loss of energy = F(fr) d
F(fr) d = 0.27 + 0.0441 = 0.3141 Joules
F(fr) = .3141 / 2.5 = 0.126 Newtons of Friction
Energy of bead at point
PE
Energy of bead at point
Loss in energy while bead moves from
Taking
Using Law of conservation of energy, this loss is equal to work done against force of friction.
Work done against force of friction
If