StudyBrixFree worksheets, study guides and courses

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 4 of 5

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

1Motion & graphsIn a model without air resistance, an object is launched vertically upward at 50 m/s on Earth (use the rounded value g = 10 m/s²). Find its time to maximum height. Round to 3 decimal places if needed. Answer in s.
s
2Motion & graphsIn one dimension, u = 13 m/s and constant a = 8 m/s². Find the signed velocity after 9 s. Round to 3 decimal places if needed. Answer in m/s.
m/s
3Forces & equilibriumAn ideal spring obeys F = kx with k = 430 N/m. A force of 29 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 132 N and kinetic friction coefficient 0.6. 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 = 370 N/m and extension 27 cm. Find the stored elastic energy. Round to 3 decimal places if needed. Answer in J.
J
6Energy, work & powerA 7 kg object changes speed from 4 m/s to 18 m/s. Find final minus initial kinetic energy. Round to 3 decimal places if needed. Answer in J.
J
7Momentum & collisionsA 6 kg object changes signed velocity from 13 m/s to 20 m/s. Find the net impulse on it. Round to 3 decimal places if needed. Answer in N·s.
N·s
8Momentum & collisionsA 1 kg object has signed velocity -5 m/s on a chosen axis. Find its signed momentum. Round to 3 decimal places if needed. Answer in kg·m/s.
kg·m/s
9Thermal physicsMix 7 kg at 21 °C with 4 kg at 75 °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
10Thermal physicsA 1.6 kg sample with specific heat 500 J/(kg·°C) warms by 16 °C. No phase change or heat loss occurs. Find energy supplied. Round to 3 decimal places if needed. Answer in J.
J
11Electricity & circuitsA 12 V battery is connected to two resistors in series. The voltage across the first resistor is 7.2 V. What is the voltage across the second resistor? (Assume ideal wires and an ideal battery.)
V
12Electricity & circuitsA theoretical 13 V ideal source supplies parallel ohmic resistors 9 Ω and 9 Ω. Find total source current. Round to 3 decimal places if needed. Answer in A.
A
13Magnetism & inductionAn ideal AC transformer has primary 200 turns, secondary 1900 turns and primary voltage 3 V. Find secondary voltage. Paper model only. Round to 3 decimal places if needed. Answer in V.
V
14Magnetism & inductionA 25 cm straight wire carries 13 A perpendicular to a uniform field of 0.7 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.

15Motion & graphs (Grade 11)Two carts approach each other on a straight track at 19 m/s and 28 m/s. How fast is their separation decreasing? Round to 3 decimal places if needed. Answer in m/s.
m/s
16Forces & equilibrium (Grade 11)On a weightless balanced beam, 21 N acts 9 m left of the pivot. What downward force at 8 m right balances it? Forces are perpendicular to the beam. Round to 3 decimal places if needed. Answer in N.
N