6.2. Elastic and plastic behaviour
A subsection of Physics, 9702, through 6. Deformation of solids
Listing 10 of 75 questions
A child moves down a long slide, as shown in . Y X surface of slide child (not to scale) The child moves from rest at the top end X of the slide. An average resistive force of 76 N opposes the motion of the child as they move to the lower end Y of the slide. The kinetic energy of the child at Y is 300 J. The decrease in gravitational potential energy of the child as it moves from X to Y is 3200 J. Determine the ratio kinetic energy of the child at Y when the resistive force is 76 N kinetic energy of the child at Y if there is no resistive force . ratio = Use the answer in to calculate the ratio speed of the child at Y when the resistive force is 76 N speed of the child at Y if there is no resistive force . ratio = Calculate the length of the slide from X to Y. length = m At end Y of the slide, the child is brought to rest by a board, as shown in . surface of slide child board spring (not to scale) A spring connects the board to a fixed point. The spring obeys Hooke’s law and has a spring constant of 63 N m–1. The child hits the board so that it moves to the right and compresses the spring. The speed of the child becomes zero when the elastic potential energy of the spring has increased to its maximum value of 140 J. Calculate the maximum compression of the spring. maximum compression = m Calculate the percentage efficiency of the transfer of the kinetic energy of the child to the elastic potential energy of the spring. percentage efficiency = % The maximum compression of the spring is x0. On , sketch a graph to show the variation of the elastic potential energy of the spring with its compression x from x = 0 to x = x0. Numerical values are not required. elastic potential energy x x0
9702_m22_qp_22
THEORY
2022
Paper 2, Variant 2
View
Questions Discovered
75