Forces & Dynamics

• Newton's third law – interaction pairs Physics · Forces & Dynamics Seven situations: a person pushing a wall, two skaters pushing apart, a book on a table, two spring balances pulling... Ages 15–16
• Hooke's law and liquid pressure Physics · Forces & Dynamics Left: a spring of stiffness k holds a hanging mass m, stretching by Δl = mg/k; pull the mass down and release it to... Ages 15–16
• Hooke's law – springs Physics · Forces & Dynamics Three screens to explore Hooke's law. Intro lets you stretch or compress one or two independent horizontal springs... Ages 15–16
• Newton's second law – pulling a block on a surface Physics · Forces & Dynamics Pull a block of mass m with force F along a horizontal or inclined surface with friction μ. Watch the force vectors... Ages 15–16
• Falling-ball viscometer – Stokes' law and terminal velocity Physics · Forces & Dynamics A virtual practical to measure viscosity: drop steel balls of different radii into glycerol, castor oil or water,... Ages 15–16
• Measuring the coefficient of kinetic friction on an inclined plane Physics · Forces & Dynamics Virtual lab: a block slides from rest down a board inclined at angle α, and a digital timer with two light gates... Ages 15–16
• Fluid flow – continuity, Bernoulli's principle and Torricelli's law Physics · Forces & Dynamics A pipe with three sections whose cross-sections and height you can change: tracer particles show that the flow rate... Ages 15–16
• Masses and springs – basics Physics · Forces & Dynamics Hang masses on a spring one at a time and measure the extension at equilibrium across three screens: Stretch, Bounce... Ages 15–16
• Forces on a particle and connected bodies – equilibrium, inclines, Atwood Physics · Forces & Dynamics Three screens: Equilibrium (a force table with 2–4 forces, components, resultant, polygon of forces and Lami's... Ages 15–16
• Centripetal force – uniform circular motion on a string Physics · Forces & Dynamics A mass m tied to a string of length R moves in uniform circular motion with angular speed ω (viewed from above). The... Ages 15–16
• Moments – principle of moments and couples Physics · Forces & Dynamics A virtual lab with a rod pivoted at its centre and equally spaced holes: drag masses onto holes on either side and... Ages 15–16
• Rotational inertia and τ = Iα – turntable lab, angular momentum and rolling Physics · Forces & Dynamics A virtual lab on rotational dynamics. A falling mass on a string wound round a drum turns a rod with two movable... Ages 15–16
• Pascal's principle – hydraulic jack, press and brakes Physics · Forces & Dynamics A force F₁ on the small piston raises the pressure of the liquid by p = F₁/A₁ everywhere, so the large piston pushes... Ages 15–16
• Surface tension and capillary rise – travelling microscope lab Physics · Forces & Dynamics A virtual practical to measure surface tension γ with capillary tubes and a travelling microscope: read the two... Ages 15–16
• Centre of mass, centre of gravity and stability – plumb line and toppling Physics · Forces & Dynamics Three screens: place point masses on a rod or a plane, choose which ones are inside the system boundary and watch... Ages 15–16
• Free-body diagrams – inclines, lifts and pulleys Physics · Forces & Dynamics Six situations: a block on a rough incline (at rest or sliding down), a block sliding up a slope, a mass pulled up... Ages 15–16

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