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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 2 of 5

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

1Motion & graphsSigned velocity changes from 16 m/s to 10 m/s in 15 s. Find the average acceleration. Round to 3 decimal places if needed. Answer in m/s².
m/s²
2Motion & graphsTwo carts approach each other on a straight track at 16 m/s and 23 m/s. How fast is their separation decreasing? Round to 3 decimal places if needed. Answer in m/s.
m/s
3Forces & equilibriumOn a weightless balanced beam, 88 N acts 10 m left of the pivot. What downward force at 9 m right balances it? Forces are perpendicular to the beam. Round to 3 decimal places if needed. Answer in N.
N
4Forces & equilibriumA 7 kg cart has horizontal forces 91 N right and 118 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
5Energy, work & powerA device receives 680 J and has useful-energy efficiency 5%. Find the useful output energy. Round to 3 decimal places if needed. Answer in J.
J
6Energy, work & powerA model device transfers energy at constant power 830 W for 59 s. Find the transferred energy. Round to 3 decimal places if needed. Answer in J.
J
7Momentum & collisionsA 19 kg object changes signed velocity from 15 m/s to -11 m/s. Find the net impulse on it. Round to 3 decimal places if needed. Answer in N·s.
N·s
8Momentum & collisionsA 19 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
9Pressure & fluidsAn object displaces 39 litres of fluid of density 1000 kg/m³. Use g = 10 N/kg and 1 litre = 0.001 m³. Find buoyant force. Round to 3 decimal places if needed. Answer in N.
N
10Pressure & fluidsA normal force of 505 N acts uniformly over 0.22 m². Find the pressure. Round to 3 decimal places if needed. Answer in Pa.
Pa
11Waves & soundIs a radio wave a transverse wave or a longitudinal wave?
12Waves & soundAn echo returns after 460 ms. The sound speed in this medium is 1500 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 1625 W for 12 h. Find the energy in kilowatt-hours. Round to 3 decimal places if needed. Answer in kWh.
kWh
14Electricity & circuitsA constant current of 1.3 A flows for 8 s. Find transferred charge. Round to 3 decimal places if needed. Answer in C.
C