Problem 9 A bead slides on a wire, which is in a vertical plane, as shown in the

Question

Problem 9 A bead slides on a wire, which is in a vertical plane, as shown in the diagram. Gravity acts in the -y direction. The bead starts at A, moving to the right with an initial velocity v. The wire is frictionless between A and D and between F and G, but there is friction between D and F. (For each statement select True, False, Greater than, Less than, Equal to, or Not enough information to tell The bead's kinetic energy at B is its kinetic energy at F Between C and D, the speed increases, then decreases The speeds at D and E are equal The total energy of the bead at Ais the total energy at B True False Greater than Less than Equal to Not enough information to tell

Explanation / Answer

1) The bead's kinetic energy at B is greater than to the kinetic energy at F. Because there is friction between D to F so the kinetic energy loss and bead goes slow .

2) between C to D speed increase because C has more potential energy than the D.

3) speed at D is greater than speed at E because there is frictional force which oppose the speed of bead and bead go slow than the D.

4) Total energy at A is equal to the total energy at B, because there is no loss in energy.

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