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Grade 12 · Physics

Grade 12 Physics diagnostic

16 questions on motion & graphs, forces & equilibrium, energy, work & power, momentum & collisions, thermal physics, electricity & circuits and magnetism & induction, plus 2 from Grade 11. Answer what you can, then check your answers to see which topics are secure and what to practise next.

16 questions7 topicsAbout 20 minutesSet 3 of 5

Skip a question if you do not know the answer. It is better than guessing, because it shows what to practise.

1Motion & graphsA cart moves at 9 m/s, then slows at a constant 1 m/s² to rest. Find its braking distance, excluding any reaction distance. Round to 3 decimal places if needed. Answer in m.
m
2Motion & graphsUse one signed axis. Initial velocity is 8 m/s and constant acceleration is 2 m/s² for 11 s. Find the displacement. Round to 3 decimal places if needed. Answer in m.
m
3Forces & equilibriumAn ideal spring obeys F = kx with k = 510 N/m. A force of 31 N is applied within its linear range. Find its extension. Round to 3 decimal places if needed. Answer in m.
m
4Forces & equilibriumA sliding block has normal force 310 N and kinetic friction coefficient 0.8. Find the friction-force magnitude in this model. Round to 3 decimal places if needed. Answer in N.
N
5Energy, work & powerAn ideal linear spring has k = 120 N/m and extension 29 cm. Find the stored elastic energy. Round to 3 decimal places if needed. Answer in J.
J
6Energy, work & powerA constant 73 N force acts through a 1 m displacement. The cosine of the angle between them is -1. Find the work by this force. Round to 3 decimal places if needed. Answer in J.
J
7Momentum & collisionsCarts 15 kg at 17 m/s and 13 kg at -8 m/s collide and stick. Velocities share one signed axis; external impulse is zero. Find their final velocity. Round to 3 decimal places if needed. Answer in m/s.
m/s
8Momentum & collisionsMomentum changes by +76 kg·m/s during 230 ms. Find the signed average net force. Round to 3 decimal places if needed. Answer in N.
N
9Thermal physicsA 80 g sample completely melts at its melting temperature. Its latent heat is 320000 J/kg. Ignore losses. Find energy required. Round to 3 decimal places if needed. Answer in J.
J
10Thermal physicsMix 9 kg at 11 °C with 7 kg at 79 °C of the same liquid. Assume equal constant specific heat, no phase change, negligible container heat capacity and no losses. Find equilibrium temperature. Round to 3 decimal places if needed. Answer in °C.
°C
11Electricity & circuitsIn a theoretical circuit, 3 Ω and 14 Ω are in series across an ideal 40 V source. Find their total electrical power. Round to 3 decimal places if needed. Answer in W.
W
12Electricity & circuitsA theoretical 20 V ideal source supplies parallel ohmic resistors 21 Ω and 14 Ω. Find total source current. Round to 3 decimal places if needed. Answer in A.
A
13Magnetism & inductionA 470-turn coil has flux change 21 mWb per turn over 80 ms. Find average induced emf magnitude. Round to 3 decimal places if needed. Answer in V.
V
14Magnetism & inductionA 51 cm straight wire carries 6 A perpendicular to a uniform field of 1.9 T. Find magnetic force magnitude. Round to 3 decimal places if needed. Answer in N.
N

From Grade 11

These questions check skills from the grade below, so gaps can be spotted early.

15Electricity & circuits (Grade 11)A model device uses constant power 1025 W for 18 h. Find the energy in kilowatt-hours. Round to 3 decimal places if needed. Answer in kWh.
kWh
16Forces & equilibrium (Grade 11)Which is the partner of Earth's gravitational force on a book?