Mechanics 2 edexcel january 2014 mark scheme
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They are not model answers but indicat e what t he Examiners accept ed in t his examinat ion. Answers without working may not gain full credit. Instructionst Use black ink or ball-point pen. Use of an inappropriat e number of signif icant f igures will normally be penalised in t he pract ical t est s. The acceleration of P, in the positive x direction at time t seconds, is 2t 3 m s2. Advicet Read each question carefully before you start to answer it. Particle P is projected towards Q with speed u and collides directly with Q.

A particle P moves on the x-axis. Error carried f orward: In general, an error made in an early part of a quest ion is penalised t here but not subsequent ly, i. A particle of mass 0. . The rod and the strut lie in the same vertical plane, which is perpendicular to the wall. Calculators must not have the facility for symbolic algebra manipulation, differentiation and integration, or have retrievable mathematical formulae stored in them.

At a given instant the car and the trailer are moving down the road with speed 25 m s1 and acceleration 0. The coefficient of restitution between P and Q is 19. Registered in England and Wales No. Al t ernat ive responses: There was of t en more t han one correct response t o a part icular quest ion and t hese published mark schemes do not give al l possible alt ernat ives. The three particles lie at rest in a straight line on a smooth horizontal table with Q between P and R.

The towbar joining the car to the trailer is modelled as a light rod which is parallel to the direction of motion. We provide a wide range of qualifications including academic, vocational, occupational and specific programmes for employers. Informationt The total mark for this paper is 75. Registered in England and Wales no. In general candidat es should nevert heless be guided by t he numbers of signif icant f igures in t he dat a provided in t he quest ion. The mark will somet imes be a separat e mark and somet imes be an opt ion in a list of marking point s. A trailer of mass 250 kg is towed by a car of mass 1000 kg.

When P passes through the point B on its path, it has speed 7 m s1. They generally show only t he schemes f or t he most common responses given by candidat es. If you have any subject specific questions about the content of this Mark Scheme that require the help of a subject specialist, you may find our Ask The Expert email service helpful. Qual it y of writ t en communicat ion: Each t heory paper will usually have 1 or 2 marks f or t he qualit y of writ t en communicat ion. Scheme Marks a Rectangle 24xx Semicircles4. The strut is freely hinged to the rod at the point D and to the wall at the point C, which is vertically below A, as shown in Figure 1.

Coloured pencils and highlighter pens must not be used. Three particles P, Q and R have masses 3m, km and 7. Unit penal t ies: A wrong or missing unit in t he answer t o a calculat ion will generally lose one mark unless ot herwise indicat ed. Immediately after receiving the impulse the particle is moving with speed 15 m s1 in a direction which makes an acute angle with the vector i. The velocity of P, in the positive x direction at time t seconds, is v m s1.

Find i the value of K, ii the size of angle. A particle P is projected from a fixed point A with speed 4 m s1 at an angle above the horizontal and moves freely under gravity. The resistance to motion of the trailer is modelled as a single force of magnitude 100 N acting parallel to the road. . . .

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