The newest 5 of 5 written questions. Open one to see it on the real paper.
As the climber descends, the rope passes through the climber’s hands as he controls his speed of descent and his hands get hot. Name the force between two surfaces that produces heating.
See it on the paper →Describe, in terms of forces and energy transfers, how lubricants increase the efficiency of a machine.
See it on the paper →State the name of the force that impedes the skier’s motion.
See it on the paper →Name the force that prevents the brick from moving before the board is raised to 40°.
See it on the paper →Suggest how the motion of the brick would be different if a board with a smooth surface was used.
See it on the paper →The most successful candidates described how lubricants increase the efficiency of a machine in terms of forces and energy transfers as indicated by the question. It was often correctly stated that lubricants reduce the force due to friction causing less energy to be transferred as heat. The role of wasted energy in reducing efficiency was less well known.
— Examiner report, May/June 2022, 0654/43 Q3(b)(i) (Cambridge)
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