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Resolving forces in equilibrium Displacement and velocity are vectors One projectile, two motion graphs From a velocity graph to kinetic energy Resolve a launch velocity before analysing a projectile Only the force component along the motion does work Resultant work changes kinetic energy Scalars and vectors2.3 Scalar and vector quantities2.3.1 Kinematics3.1.1 Projectile motion3.1.3 Equilibrium3.2.3 Work and conservation of energy3.3.1 Kinetic and potential energies3.3.2
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Only the force component along the motion does work

OCR A AS Physics · Two ideas, one explanation

An angled force can both support an object and move it. Resolving the force identifies the component that transfers energy through a given displacement.

W = Fs cos θ

Follow the reasoning

  1. Identify the displacement direction.
  2. Measure the angle between force and displacement.
  3. Multiply the parallel force component by the displacement.
Specification outcomes (3)
  • 2.3.1(d) Resolve a vector into two perpendicular components, Fx = F cos θ and Fy = F sin θ.
  • 3.3.1(a) Define work done by a force and the unit joule.
  • 3.3.1(b) Use W = F x cos θ for work done by a force.
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H156 v2.0 · May 2026

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