By Stephen Lee

Movement alongside a immediately line Newton’s legislation of movement Vectors Projectiles Equilibrium of a particle Friction Moments of forces Centre of mass power, paintings and tool Impulse and momentum Frameworks round movement Elasticity uncomplicated harmonic movement Damped and compelled oscillations Dimensional research Use of vectors Variable forces Variable mass Dynamics of inflexible our bodies rotating round a set axis balance and small Read more...

summary: movement alongside a directly line Newton’s legislation of movement Vectors Projectiles Equilibrium of a particle Friction Moments of forces Centre of mass power, paintings and gear Impulse and momentum Frameworks round movement Elasticity uncomplicated harmonic movement Damped and compelled oscillations Dimensional research Use of vectors Variable forces Variable mass Dynamics of inflexible our bodies rotating round a hard and fast axis balance and small oscillations

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Extra resources for An Introduction to Mathematics for Engineers : Mechanics

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Oil can make surfaces smooth and ice is often modelled as a smooth surface. 41 42 AN INTRODUCTION TO MATHEMATICS FOR ENGINEERS: MECHANICS When the contact between two surfaces is smooth, the only force between them is at right angles to any possible sliding and is just the normal reaction. 1 What direction is the reaction between the sweeper’s broom and the smooth ice? A TV set is standing on a small table. Draw a diagram to show the forces acting on the TV and on the table as seen from the front.

Michelle’s treacher tells her that a better model would be 1 s ϭ 10t 2 Ϫ 2t 3 ϩ ᎏ1ᎏ0t 4. (B) Compare the two models. 1 Using a mathematical model ● Make simplifying assumptions by deciding what is most relevant. For example: a car is a particle with no dimensions a road is a straight line with one dimension acceleration is constant. ● Define variables and set up equations. ● Solve the equations. ● Check that the answer is sensible. If not, think again. 2 Vectors (with magnitude and direction) Scalars (magnitude only) Displacement Distance Position – displacement from a fixed origin Velocity – rate of change of position Speed – magnitude of velocity Acceleration – rate of change of velocity Time ● Vertical is towards the centre of the earth; horizontal is perpendicular to vertical.

9 An object moves along a straight line so that its position at time t in seconds is given by x ϭ 2t 3 Ϫ 6t (in metres) i) ii) iii) iv) (t у 0). Find expressions for the velocity and acceleration of the object at time t. Find the values of x, v and a when t ϭ 0, 1, 2 and 3. Sketch the graphs of x, v and a against time. Describe the motion of the object. SOLUTION i) Position Velocity Acceleration x ϭ 2t 3 Ϫ 6t dx v ϭ ᎏᎏ ϭ 6t 2 Ϫ 6 dt dv a ϭ ᎏᎏ ϭ 12t dt ➀ ➁ ➂ You can now use these three equations to solve problems about the motion of the object.

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