How to Choose an Integration Method
Compare substitution, integration by parts, partial fractions and trigonometric substitution, with sign-aware radical choices, worked examples and progressive checks.
Help with derivatives, integrals, motion, areas and volumes in Durham MATH 3132.
MATH 3132 combines differential and integral calculus in Durham’s Mechanical Engineering Technology curriculum. Rates, motion, areas and volumes connect symbolic techniques to physical quantities. In motion problems, integrating velocity gives signed displacement; finding distance travelled may require splitting the interval where direction changes. Continuing students should use their own intake-year program of study.
Review factoring polynomials and determining their signs on intervals. To interpret a velocity integral, mark its zeros on a time line first. Use the graph to predict cancellation before calculating; a zero displacement does not necessarily mean the object stayed still.
The guidance above is study preparation, not an eligibility decision. Confirm current prerequisites, restrictions and availability with Durham College.
Check the official course catalogueAn object has velocity m/s for , with in seconds. Find displacement and total distance travelled.
Factor . It is negative on and positive on , so the object reverses direction at 2 s.
An antiderivative is . Displacement is . The object ends where it started.
The first displacement is ; the second is . Distance is . Taking the absolute value only after combining the integrals would lose the journey.
Over , what are displacement and distance?
Displacement is −4 m and distance is 4 m. There is no reversal inside this shorter interval, so one sign applies throughout its interior.
Share a derivative or integral question, even if you are unsure of the first step. For integration, a tutor can help you identify the accumulated quantity, sketch the situation and choose the bounds. We can work through sign changes together, then explore how a shorter interval changes the answer.
Practise both derivative applications and definite integrals from the chapters announced for your assessment. Label all quantities and units, and distinguish signed results from nonnegative geometric quantities. Explain why an interval must be split before adding its pieces.
Use your section’s outline to choose the chapters to review. We work through permitted practice and comparable problems, without completing graded assignments or exams on your behalf.
Compare substitution, integration by parts, partial fractions and trigonometric substitution, with sign-aware radical choices, worked examples and progressive checks.
Translate a motion story into position, velocity and acceleration graphs. Read slopes and signed areas, choose valid kinematics equations, and try six explained questions.
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