Quiz 3 (solution)
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School
Victory College**We aren't endorsed by this school
Course
PHY 625
Subject
Physics
Date
Jan 15, 2025
Pages
6
Uploaded by MagistrateThunderWren50
Physics 0625 (Core)Mr. Hesham SaadNameClassSchoolQuiz (3)_________25
1(a) The mass of a small steel ball is 120 g. The volume of the ball is 16.0 cm3.(i)Calculate the density of the steel ball.density = ...............................................g/ cm3[3](ii)The ball falls to the ground from rest. At a time of 0.2 s after it started to fall, its accelerationis 9.8m / s2.State the acceleration of the ball at a time of 0.1 s after it started to fall........................................................................................................................................[1](b)Fig. 3.1 shows the vertical forces that act on a large plastic ball as it is falling.0.3Nlarge plasticball1.2NFig. 3.1(not to scale)(i)State the name given to each of the forces shown in Fig. 3.1.1. .......................................................................................................................................2. .......................................................................................................................................[1](ii)Calculate the size of the resultant force on the ball.resultant force = ......................................................N [1][Total: 6]
2Fig. 3.1 shows a wheelbarrow and Fig. 3.2 shows the dimensions of its wheel.pivotload1.50m 35cm = diameter of wheel 25mm = diameter of axleFig. 3.1 Fig. 3.2(a) Complete the table to show the diameter of the wheel and axle in metres.measurementmeasurement in metresdiameter of wheel35 cmdiameter of axle25 mm[2](b) The mass of the wheelbarrow is 20 kg. The mass of the load in the wheelbarrow is 30 kg.Calculate the total weight of the wheelbarrow and its load.weight of wheelbarrow and load = ....................................................N [3](c) A man lifts the handle of the wheelbarrow. He applies a force of 140 N, as shown in Fig. 3.3.wheelbarrow140Nhandle1.30mpivotFig. 3.3Calculate the moment of the force about the pivot. Include the unit.moment = ........................................................[4][Total: 9]
3Fig. 4.1 shows a flat-top cone and a sphere, resting on a table.flat-top conespheretableFig. 4.1(a) On Fig. 4.1, mark a cross on each object to show the position of the centre of mass of eachobject. [2](b) The cone is inverted and balanced on its top, as shown in Fig. 4.2.invertedflat-topconeflat-topconeFig. 4.2Explain why the flat-top cone is less stable when it is inverted..........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................[2][Total: 4]___________________________________________________________________________________________________Four objects are each acted on by only two forces, as shown. Which object is in equilibrium? AB3.0N2.0N4.0N4.0N1.0N2.0N2.0N2.0NCD1
2A student measures the length of a spring. She then attaches different weights to the spring. She measures the length of the spring for each weight. The table shows her results. weight/N ength/mm 52001.05242.0.03.0.04.0.05.0.0What is the extension of the spring with a weight of 3.0N attached to it? A 4mm B 5mm C 12mm D 13mm 5285335375403Which quantity is a force due to a gravitational field? no changeB mass C weight D volume 4Diagram 1 shows a piece of foam rubber that contains many pockets of air. Diagram 2 shows the same piece of foam rubber after it has been compressed so that its volume decreases. diagram 1(before compression)diagram 2(after compression)What happens to the mass and to the weight of the foam rubber when it is compressed? massweightA increasesincreasesB increasesC no change increases D no change no change A density
5The diagrams represent the only two forces acting on an object. Which object could be moving to the right at constant speed? B1.0N1.0NA1.0N1.0NC1.0N2.0ND2.0N1.0N6A student determines the position of the centre of gravity of a piece of card. The diagram shows the equipment that is available. The equipment is not drawn to scale. clamp and standpinpencilstop-watchcardweight on athin stringWhich piece of equipment is notneeded? Apencil Bpin Cweight on a thin string Dstop-watch