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Grade 9 · Physics

Grade 9 Physics diagnostic

14 questions on motion & graphs, forces & equilibrium, energy, work & power, momentum & collisions, pressure & fluids, waves & sound and electricity & circuits. Answer what you can, then check your answers to see which topics are secure and what to practise next.

14 questions7 topicsAbout 15 minutesSet 5 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 robot moves 49 m east and then 46 m west along a straight line. Find the total distance travelled. Round to 3 decimal places if needed. Answer in m.
m
2Motion & graphsIn one dimension, u = -11 m/s and constant a = 7 m/s². Find the signed velocity after 11 s. Round to 3 decimal places if needed. Answer in m/s.
m/s
3Forces & equilibriumA 12 kg cart has horizontal forces 143 N right and 10 N left. No other horizontal forces act. Taking right as positive, find its acceleration. Round to 3 decimal places if needed. Answer in m/s².
m/s²
4Forces & equilibriumOn a weightless balanced beam, 21 N acts 2 m left of the pivot. What downward force at 3 m right balances it? Forces are perpendicular to the beam. Round to 3 decimal places if needed. Answer in N.
N
5Energy, work & powerA 18 kg load is raised vertically by 11 m in a field g = 10 N/kg. Find its gravitational potential-energy gain. Round to 3 decimal places if needed. Answer in J.
J
6Energy, work & powerA 10 kg object changes speed from 19 m/s to 29 m/s. Find final minus initial kinetic energy. Round to 3 decimal places if needed. Answer in J.
J
7Momentum & collisionsA 8 kg object has signed velocity 11 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
8Momentum & collisionsA 8 kg object changes signed velocity from 5 m/s to -16 m/s. Find the net impulse on it. Round to 3 decimal places if needed. Answer in N·s.
N·s
9Pressure & fluidsA liquid has uniform density 800 kg/m³. At depth 16 m, with g = 10 m/s², find pressure above its surface pressure. Round to 3 decimal places if needed. Answer in Pa.
Pa
10Pressure & fluidsA normal force of 616 N acts uniformly over 0.22 m². Find the pressure. Round to 3 decimal places if needed. Answer in Pa.
Pa
11Waves & soundA wave has frequency 90 Hz and wavelength 1.4 m. Find its speed. Round to 3 decimal places if needed. Answer in m/s.
m/s
12Waves & soundAn echo returns after 1120 ms. The sound speed in this medium is 340 m/s. Find the distance to the stationary reflector. Round to 3 decimal places if needed. Answer in m.
m
13Electricity & circuitsA model device uses constant power 1675 W for 19 h. Find the energy in kilowatt-hours. Round to 3 decimal places if needed. Answer in kWh.
kWh
14Electricity & circuitsAn ohmic resistor of 13 Ω has potential difference 22 V. Find current. This is a paper calculation, not a construction instruction. Round to 3 decimal places if needed. Answer in A.
A