1.7.2. Work
A subsection of Physics, 0625, through 1. Motion, forces and energy
Listing 10 of 86 questions
shows a student using a battery-powered device. 14 N battery State the energy store in the battery. The student pushes the device along the floor at a constant speed with a horizontal force of 14 N. The student pushes the device for a distance of 4.5 m. Calculate the mechanical work done by the force pushing the device. work done = J The student uses the device for a time of 30 s. The energy input to the device is 5400 J. Calculate the power input to the device. power input = W
0625_m24_qp_32
THEORY
2024
Paper 3, Variant 2
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An electric pump is used to raise water from a well, as shown in . pump ground well The pump does work in raising the water. State an equation that could be used to calculate the work done in raising the water. The water is raised through a vertical distance of 8.0 m. The weight of water raised in 5.0 s is 100 N. Calculate the work done in raising the water in this time. work done = Calculate the power the pump uses to raise the water. power = The energy transferred by the pump to the water is greater than your answer to . Suggest what the additional energy is used for.
0625_s06_qp_3
THEORY
2006
Paper 3, Variant 0
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represents the energy into and out of a machine. input energy I wasted energy W useful output energy U Write down the equation linking I, U and W. An electric motor and a pulley in a warehouse are being used to lift a packing case of goods from the ground up to a higher level. This is shown in . cable pulley chains pallet ground packing case electric motor The packing case of goods, the chains and the pallet together weigh 850 N. State the value of the tension force in the cable when the load is being lifted at a steady speed. tension force = N When the load is just leaving the floor, why is the force larger than your answer to ? The warehouse manager wishes to calculate the useful work done when the load is lifted from the ground to the higher level. Which quantity, other than the weight, does he need to measure? Which further quantity does the manager need to know, in order to calculate the power required to lift the load? How does the electrical energy supplied to the electric motor compare with the increase in energy of the load? Answer by completing the sentence below. The electrical energy supplied to the motor is ……………………………… the increase in energy of the load.
0625_s10_qp_21
THEORY
2010
Paper 2, Variant 1
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Questions Discovered
86