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Grade 7 · Physics

Grade 7 Physics diagnostic

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

12 questions5 topicsAbout 15 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 & graphsOn an east-positive axis, position changes from -8 m to 20 m in 24 s. Find the signed average velocity. Round to 3 decimal places if needed. Answer in m/s.
m/s
2Motion & graphsA robot moves 127 m east and then 48 m west along a straight line. Find the total distance travelled. Round to 3 decimal places if needed. Answer in m.
m
3Motion & graphsWhich straight segment shows larger speed: slope +2 m/s or slope −5 m/s?
4Forces & equilibriumA mass of 78 kg is in a model gravitational field of 9.8 N/kg. Find its weight. Round to 3 decimal places if needed. Answer in N.
N
5Forces & equilibriumA 9 kg cart has horizontal forces 101 N right and 18 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
6Energy, work & powerA model device transfers energy at constant power 115 W for 8 s. Find the transferred energy. Round to 3 decimal places if needed. Answer in J.
J
7Energy, work & powerA 20 kg load is raised vertically by 13 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
8Energy, work & powerA model device transfers energy at constant power 675 W for 33 s. Find the transferred energy. Round to 3 decimal places if needed. Answer in J.
J
9Pressure & fluidsA normal force of 526 N acts uniformly over 0.37 m². Find the pressure. Round to 3 decimal places if needed. Answer in Pa.
Pa
10Pressure & fluidsA liquid has density 1000 kg/m³. At depth 2 m, with g = 10 m/s², find pressure above surface pressure.
Pa
11Waves & soundA wave has frequency 35 Hz and wavelength 3.5 m. Find its speed. Round to 3 decimal places if needed. Answer in m/s.
m/s
12Waves & soundCrest-to-trough height is 10 cm for a symmetric wave. Find amplitude.
cm