1.3. Mass and weight
A subsection of Physics, 5054, through 1. Motion, forces and energy
Listing 10 of 86 questions
shows a small brick hanging from a newton meter. newton meter brick The reading on the newton meter is 3.0 N. Describe how the reading on the newton meter is used to find the mass of the brick. The same brick and newton meter are used in the apparatus shown in . The meter rule is pivoted at its centre and is balanced. The reading on the newton meter is not shown. newton meter 20 cm 10 cm pivot uniform metre rule State the principle of moments for a body in equilibrium. Determine the reading on the newton meter shown in . reading = A beaker of water is placed so that the brick is partly submerged in the water, as shown in . The apparatus is adjusted to keep the rule horizontal. newton meter 20 cm 10 cm pivot uniform metre rule water Suggest why the reading on the newton meter is less than your answer in .
5054_s21_qp_22
THEORY
2021
Paper 2, Variant 2
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A space research organisation plans to send astronauts to Mars to examine rocks on its surface. The organisation will produce a report containing information about conditions on Mars. The gravitational field strength on the surface of Mars is 3.7 N / kg. Calculate the weight, on Mars, of a rock of mass 0.50 kg. A rock dropped on Mars falls to the surface. State the acceleration of the falling rock. Assume that there is no air resistance on Mars. Calculate the kinetic energy of a 0.50 kg rock as it strikes the surface at a speed of 3.2 m/s. While still on the surface of Mars, the astronauts will measure the mass of each rock collected. shows two devices for measuring mass. 50g 50g 50g 50g 10g 10g 20g 20g 20g 20g device A rock device B g rock A lever arm balance and a set of brass discs. The mass of each disc is accurately determined on Earth and the value is marked on it. A spring balance. The spring balance is accurately calibrated on Earth and the mass values are marked on the vertical scale. When the two devices are used on Mars, they will give different readings for the mass of the same rock. Explain why. State which device will give the correct reading for the mass. The astronauts will also determine the density of each rock. Apart from the mass of the rock, state what other information is needed in order to calculate the density of the rock. Describe a method for determining the density of a small, irregularly shaped rock of known mass m.
5054_w09_qp_2
THEORY
2009
Paper 2, Variant 0
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Questions Discovered
86