StudyBrixFree worksheets, study guides and courses

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 1 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 one dimension, u = -8 m/s and constant a = -1 m/s². Find the signed velocity after 11 s. Round to 3 decimal places if needed. Answer in m/s.
m/s
2Motion & graphsOn an east-positive axis, position changes from 18 m to 18 m in 24 s. Find the signed average velocity. Round to 3 decimal places if needed. Answer in m/s.
m/s
3Forces & equilibriumA 8 kg cart has horizontal forces 115 N right and 80 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 & equilibriumA mass of 60 kg is in a model gravitational field of 10 N/kg. Find its weight. Round to 3 decimal places if needed. Answer in N.
N
5Energy, work & powerA 2 kg object changes speed from 9 m/s to 16 m/s. Find final minus initial kinetic energy. Round to 3 decimal places if needed. Answer in J.
J
6Energy, work & powerA 40 kg load is raised vertically by 14 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
7Momentum & collisionsA 23 kg object has signed velocity 14 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 16 kg object changes signed velocity from 15 m/s to 18 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 1100 kg/m³. At depth 24 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 209 N acts uniformly over 0.4 m². Find the pressure. Round to 3 decimal places if needed. Answer in Pa.
Pa
11Waves & soundA wave has frequency 69 Hz and wavelength 3.3 m. Find its speed. Round to 3 decimal places if needed. Answer in m/s.
m/s
12Waves & sound69 complete oscillations take 19 s. Find the period. Round to 3 decimal places if needed. Answer in s.
s
13Electricity & circuitsAn ohmic resistor of 49 Ω has potential difference 38 V. Find current. This is a paper calculation, not a construction instruction. Round to 3 decimal places if needed. Answer in A.
A
14Electricity & circuitsA model device uses constant power 1200 W for 14 h. Find the energy in kilowatt-hours. Round to 3 decimal places if needed. Answer in kWh.
kWh