1.7.2. Work
A subsection of Physics, 5054, through 1. Motion, forces and energy
Listing 10 of 60 questions
A lorry of mass 4.4 × 104 kg travels along a straight, horizontal road at 20 m / s. Calculate the kinetic energy of the lorry. kinetic energy = The lorry driver sees an obstruction ahead and applies the brakes. The lorry slows down and stops. The lorry stops a distance of 40 m from where the driver first applies the brakes. As it slows down, the kinetic energy of the lorry decreases to zero. The kinetic energy decreases as work is done by the braking force exerted on the lorry. State the formula that relates the work done to the braking force. Calculate the braking force exerted on the lorry. force =
5054_w15_qp_21
THEORY
2015
Paper 2, Variant 1
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A solid, rectangular concrete block is lying horizontally on flat ground with one of its largest sides in contact with the ground. shows the dimensions of the block. 0.44 m 0.21 m 0.13 m The weight of the block is 240 N. Calculate the pressure on the ground caused by the block. pressure = State why the total pressure on the ground underneath the block is larger than the value obtained in . The block is of uniform density. State the height of the centre of mass of the block above the ground. height = The block is rotated about its lower, left-hand edge so that it comes to rest on one of its smallest sides. This is shown in . rotation Explain why work is done as the block is rotated.
5054_w17_qp_22
THEORY
2017
Paper 2, Variant 2
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Questions Discovered
60