1.7.2. Work
A subsection of Physics, 5054, through 1. Motion, forces and energy
Listing 10 of 60 questions
shows a lorry accelerating in a straight line along a horizontal road. The driving force on the lorry in the forward direction is D and the total backward force on the lorry is B. State and explain whether D or B is the larger force. Suggest one possible cause of the backward force B. The weight of the lorry is 300 000 N. The gravitational field strength g is 10 N / kg. Calculate the mass of the lorry. mass = The resultant force on the lorry is 15 000 N. Calculate the acceleration of the lorry. acceleration = Later, the lorry turns a corner at constant speed. Explain why the lorry accelerates even though the speed is constant.
5054_s14_qp_22
THEORY
2014
Paper 2, Variant 2
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shows a student doing a press-up. A total force F acts upwards on his hands. There is also a force upwards on his toes. 0.40 m 0.80 m 600 N F centre of mass (not to scale) The weight of the student is 600 N and this force acts downwards from his centre of mass. Explain why the student does work as his body rises from the ground. State the form of energy that the student uses to do this work. At the position shown in , the student is stationary. The weight of the student causes a moment about his toes. Calculate the moment of the weight of the student about his toes. moment = Calculate the value of the force F. F =
5054_s15_qp_21
THEORY
2015
Paper 2, Variant 1
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Questions Discovered
60