This document is an exam paper for Mechanics M1. It contains instructions for candidates on how to fill out their details, information about materials allowed and the structure of the paper. The paper contains 7 questions worth a total of 75 marks. It directs candidates to show working, label answers and provide responses in the spaces provided. Question 1 involves two particles colliding and calculates their speeds before and after, as well as determining the value of m based on impulse.
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1. Two particles A and B, of mass 5m kg and 2m kg respectively, are moving in opposite
directions along the same straight horizontal line. The particles collide directly. Immediately
before the collision, the speeds of A and B are 3 m s –1 and 4 m s –1 respectively. The
direction of motion of A is unchanged by the collision. Immediately after the collision, the
speed of A is 0.8 m s –1.
(a) Find the speed of B immediately after the collision.
(3)
In the collision, the magnitude of the impulse exerted on A by B is 3.3 N s.
(b) Find the value of m.
(3)
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2.
A P G Q B
0.8 m 0.6 m
3m
Figure 1
A non-uniform rod AB has length 3 m and mass 4.5 kg. The rod rests in equilibrium,
in a horizontal position, on two smooth supports at P and at Q, where AP = 0.8 m and
QB = 0.6 m, as shown in Figure 1. The centre of mass of the rod is at G. Given that the
magnitude of the reaction of the support at P on the rod is twice the magnitude of the
reaction of the support at Q on the rod, find
(a) the magnitude of the reaction of the support at Q on the rod,
(3)
(b) the distance AG.
(4)
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3.
20 N
30°
Figure 2
A box of mass 5 kg lies on a rough plane inclined at 30° to the horizontal. The box is held
in equilibrium by a horizontal force of magnitude 20 N, as shown in Figure 2. The force
acts in a vertical plane containing a line of greatest slope of the inclined plane.
The box is in equilibrium and on the point of moving down the plane. The box is modelled
as a particle.
Find
(a) the magnitude of the normal reaction of the plane on the box,
(4)
(b) the coefficient of friction between the box and the plane.
(5)
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4. A car is moving on a straight horizontal road. At time t = 0, the car is moving with speed
20 m s –1 and is at the point A. The car maintains the speed of 20 m s –1 for 25 s. The car
then moves with constant deceleration 0.4 m s –2, reducing its speed from 20 m s –1 to
8 m s –1. The car then moves with constant speed 8 m s –1 for 60 s. The car then moves with
constant acceleration until it is moving with speed 20 m s –1 at the point B.
(a) Sketch a speed-time graph to represent the motion of the car from A to B.
(3)
(b) Find the time for which the car is decelerating.
(2)
Given that the distance from A to B is 1960 m,
(c) find the time taken for the car to move from A to B.
(8)
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5. A particle P is projected vertically upwards from a point A with speed u m s –1. The point
A is 17.5 m above horizontal ground. The particle P moves freely under gravity until it
reaches the ground with speed 28 m s –1.
(a) Show that u = 21
(3)
At time t seconds after projection, P is 19 m above A.
(b) Find the possible values of t.
(5)
The ground is soft and, after P reaches the ground, P sinks vertically downwards into the
ground before coming to rest. The mass of P is 4 kg and the ground is assumed to exert a
constant resistive force of magnitude 5000 N on P.
(c) Find the vertical distance that P sinks into the ground before coming to rest.
(4)
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6. [In this question i and j are horizontal unit vectors due east and due north respectively and
position vectors are given with respect to a fixed origin.]
A ship S is moving with constant velocity (–12i + 7.5j) km h–1.
(a) Find the direction in which S is moving, giving your answer as a bearing.
(3)
At time t hours after noon, the position vector of S is s km. When t = 0, s = 40i – 6j.
(b) Write down s in terms of t.
(2)
A fixed beacon B is at the point with position vector (7i + 12.5j) km.
(c) Find the distance of S from B when t = 3
(4)
(d) Find the distance of S from B when S is due north of B.
(4)
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7.
P(0.3 kg) Q(0.5 kg)
F(4 N)
Figure 3
Two particles P and Q, of mass 0.3 kg and 0.5 kg respectively, are joined by a light
horizontal rod. The system of the particles and the rod is at rest on a horizontal plane.
At time t = 0, a constant force F of magnitude 4 N is applied to Q in the direction PQ, as
shown in Figure 3. The system moves under the action of this force until t = 6 s. During
the motion, the resistance to the motion of P has constant magnitude 1 N and the resistance
to the motion of Q has constant magnitude 2 N.
Find
(a) the acceleration of the particles as the system moves under the action of F,
(3)
(b) the speed of the particles at t = 6 s,
(2)
(c) the tension in the rod as the system moves under the action of F.
(3)
At t = 6 s, F is removed and the system decelerates to rest. The resistances to motion are
unchanged. Find
(d) the distance moved by P as the system decelerates,
(4)
(e) the thrust in the rod as the system decelerates.
(3)
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