01 / Mechanics
Linear Motion
Signs, motion graphs, kinematics and two-vehicle investigations.
Explore Linear →AS91171 MECHANICSYear 12 Physics · Interactive learning
Explore / Predict / Explain
Make sense of motion.
Connect physical motion, graphs and equations. Choose a chapter, explore its activities, then test your understanding with NCEA questions.
02 / Mechanics
Vectors and Relative Velocity
Components, vector construction, reference frames and river crossings.
Explore Vectors →03 / Mechanics
Projectile Motion
Shared time, launch components, trajectories and exam investigations.
Explore Projectile →04 / Mechanics
Newton Laws and Force Balance
Forces change velocity. A free-body diagram includes only forces acting on the selected object; the net force is their vector sum.
Explore Forces →05 / Mechanics
Circular Motion
Uniform circular motion has constant speed but changing velocity. The net radial force is inward; “centripetal” describes its role, not a new type of force.
Explore Circular →06 / Mechanics
Momentum and Collisions
Momentum is a vector. For an isolated system, total momentum is conserved through a collision; kinetic energy need not be.
Explore Momentum →07 / Mechanics
Impulse and Cushioning
Impulse is the change in momentum. Spreading the same momentum change over a longer time reduces average force.
Explore Impulse →08 / Mechanics
Work, Energy and Power
Work transfers energy. Choose a system, identify energy stores and account for dissipative transfers. Power measures the rate of energy transfer.
Explore Work / Energy / Power →09 / Mechanics
Springs and Elastic Energy
Within the linear elastic range, restoring force is proportional to displacement from the natural length. The area under a force–extension graph is stored elastic energy.
Explore Springs →10 / Mechanics
Moments and Equilibrium
Equilibrium requires both zero net force and zero net moment. A force’s turning effect depends on its perpendicular distance from the pivot.
Explore Moments →One course, two levels of navigation.
Use the top navigation to choose a chapter. Inside each chapter, use its seven tabs to move from core ideas to investigations and exam practice. All ten chapters are available. All 270 questions in the seven new chapters include complete experiment inputs, live calculations and parameter investigations.
Use the top navigation to choose a chapter. Inside each chapter, use its seven tabs to move from core ideas to investigations and exam practice. All ten chapters are available. All 270 questions in the seven new chapters include complete experiment inputs, live calculations and parameter investigations.