1.8. Pressure
A subsection of Physics, 5054, through 1. Motion, forces and energy
Listing 10 of 156 questions
shows part of a hydraulic jack used to lift the front of a car. front of car arm cylinder large piston oil small piston force exerted by operator handle pivot pivot (not to scale) The operator pulls the handle and causes a force of 50 N to act on the small piston. The force exerted by the oil on the large piston increases by F. The large piston moves and rotates the arm about the pivot. This raises the front of the car. The cross-sectional area of the small piston is 1.5 cm2. The cross-sectional area of the large piston is 5.0 cm2. Calculate the pressure in the oil caused by the force on the small piston, pressure = the value of F. F = Explain why the large piston moves through a shorter distance than the small piston. The efficiency of the jack is 75%. Explain what is meant by efficiency.
5054_s14_qp_22
THEORY
2014
Paper 2, Variant 2
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shows two engineers measuring the length of a wall made from concrete. 0.25 m 2.0 m 15 m (not to scale) The wall is 2.0 m high, 15 m long and 0.25 m thick. The weight of the wall is 180 000 N and the mass of the wall is 18 000 kg. The engineers measure the length of the wall in one single measurement. State the name of the measuring instrument they use. The engineers state that the density of the concrete affects the pressure exerted by the wall on the ground but that the length of the wall does not affect this pressure. Define density. Calculate the density of the concrete. density = Calculate the pressure exerted by the wall on the ground. pressure = Without further calculation, explain why doubling the length of the wall does not change the pressure that the wall exerts on the ground.
5054_s15_qp_22
THEORY
2015
Paper 2, Variant 2
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Questions Discovered
156