Unit 2: How does physics help us to understand the world?

A focused answer to the VCE Physics Unit 2 dot point on motion graphs. Identifies slope and area on $x$-$t$, $v$-$t$ and $a$-$t$ graphs, converts between graphs, and works the VCAA SAC-style multi-phase journey problem.

A focused answer to the VCE Physics Unit 2 astrophysics option. Solar system structure, stellar life cycles (main sequence to white dwarf or supernova to neutron star or black hole), the Hertzsprung-Russell colour-magnitude diagram, distance measurement (parallax, standard candles), redshift, and the Big Bang model of the universe.

A focused answer to the VCE Physics Unit 2 dot point on uniform circular motion. Derives the centripetal acceleration $a_c = v^2/r$ and centripetal force $F_c = mv^2/r$, identifies the source of the net force in named situations (string tension, friction, gravity), and works the VCAA SAC-style turntable and banked-curve problems.

A focused answer to the VCE Physics Unit 2 dot point on collisions. Applies conservation of momentum in one dimension, distinguishes elastic from inelastic by whether KE is conserved, and works the VCAA SAC-style two-cart collision with energy-loss assessment.

A focused answer to the VCE Physics Unit 2 dot point on friction and inclined planes. Resolves weight on a ramp into parallel and perpendicular components, applies kinetic friction $f_k = \mu_k N$, and works the VCAA SAC-style box-on-ramp problem with and without friction.

A focused answer to the VCE Physics Unit 2 key knowledge point on one-dimensional kinematics. Position vs displacement, velocity vs speed, average vs instantaneous quantities, the suvat equations for uniformly accelerated motion, and graphical analysis (slope and area under graphs).

A focused answer to the VCE Physics Unit 2 key knowledge point on Newton's laws and momentum. The three laws (inertia, $F = ma$, action-reaction), free-body diagrams, momentum $p = mv$, impulse $J = F \\Delta t = \\Delta p$, and conservation of momentum in elastic and inelastic collisions.

A focused answer to the VCE Physics Unit 2 dot point on 2D projectile motion. Resolves the initial velocity into components, applies constant-acceleration equations to each axis, and works the VCAA SAC-style cliff-drop and angle-of-launch problems.

A focused answer to the VCE Physics Unit 2 dot point on scalars and vectors. Distinguishes the two with examples, applies vector addition (head-to-tail and component methods), and works the VCAA SAC-style two-leg displacement problem.

A focused answer to the VCE Physics Unit 2 dot point on connected bodies. Writes Newton's second law for each body separately, applies the same-tension and same-acceleration constraints for ideal strings and pulleys, and works the VCAA SAC-style Atwood machine and train-of-carts problems.

A focused answer to the VCE Physics Unit 2 key knowledge point on work, energy and power. Work done by a force, kinetic and gravitational potential energy, conservation of mechanical energy in conservative systems, friction and energy loss, and power $P = W/t = Fv$.

A focused answer to the VCE Physics Unit 2 dot point on the work-energy theorem. States $W_{\rm net} = \Delta KE$, applies it to a horizontal-surface braking problem and a roller-coaster-style energy-conservation problem, and identifies when energy methods beat kinematics.