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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 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 & graphsTwo carts approach each other on a straight track at 23 m/s and 24 m/s. How fast is their separation decreasing? Round to 3 decimal places if needed. Answer in m/s.
m/s
2Motion & graphsA robot moves 138 m east and then 53 m west along a straight line. Find the total distance travelled. Round to 3 decimal places if needed. Answer in m.
m
3Forces & equilibriumAn ideal spring obeys F = kx with k = 140 N/m. A force of 21 N is applied within its linear range. Find its extension. Round to 3 decimal places if needed. Answer in m.
m
4Forces & equilibriumA crate on a frictionless surface has two horizontal forces on it: 35 N toward the east and 5 N toward the west. (Vertical forces balance.) What is the size of the net force on the crate?
N
5Energy, work & powerA model device transfers energy at constant power 985 W for 3 s. Find the transferred energy. Round to 3 decimal places if needed. Answer in J.
J
6Energy, work & powerA 6 kg object changes speed from 15 m/s to 28 m/s. Find final minus initial kinetic energy. Round to 3 decimal places if needed. Answer in J.
J
7Momentum & collisionsA 29 kg object has signed velocity -7 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 17 kg object changes signed velocity from 9 m/s to -13 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 1000 kg/m³. At depth 2 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 503 N acts uniformly over 0.37 m². Find the pressure. Round to 3 decimal places if needed. Answer in Pa.
Pa
11Waves & soundA wave has frequency 31 Hz and wavelength 4.3 m. Find its speed. Round to 3 decimal places if needed. Answer in m/s.
m/s
12Waves & sound24 complete oscillations take 13 s. Find the period. Round to 3 decimal places if needed. Answer in s.
s
13Electricity & circuitsA constant current of 1.1 A flows for 100 s. Find transferred charge. Round to 3 decimal places if needed. Answer in C.
C
14Electricity & circuitsA 12 V battery is connected to two resistors in series. The voltage across the first resistor is 10 V. What is the voltage across the second resistor? (Assume ideal wires and an ideal battery.)
V