Physics questions and answers
Units, forces, motion, energy, electricity, magnetism and light.
These are practice variations, many generated from templates and numeric inputs, not an official question bank. They remain outside search indexing until at least 100 independently reviewed questions across five chapters are available.
Questions and clear answers
01Mechanics · foundation · Editorial previewWhat is the SI unit of force?+
The newton is the SI unit of force and equals one kilogram metre per second squared.
02Mechanics · foundation · Editorial previewWhat is Newton's first law?+
An object retains rest or constant straight-line motion unless acted on by a net external force.
03Motion · foundation · Editorial previewHow are speed and velocity different?+
Speed is a scalar rate of distance travelled; velocity includes a displacement direction.
04Electricity · foundation · Editorial previewWhat is Ohm's law?+
For an ohmic conductor under constant physical conditions, voltage equals current multiplied by resistance.
05Motion · advanced · Editorial previewIn physics — Motion: A vehicle travels at a constant 759 km/h for 15 hours. How far does it travel?+
Distance = speed × time = 759 × 15 = 11385 km.
06Newton's laws · foundation · Editorial previewIn physics — Newton's laws: An object of mass 22 kg accelerates at 15 m/s². Find the net force.+
Newton's second law: F = ma = 22 × 15 = 330 newtons.
07Work and energy · foundation · Editorial previewIn physics — Work and energy: A 6 N force moves an object 5 m in the same direction as the force. Calculate work.+
Work = force × displacement = 6 × 5 = 30 joules.
08Electrical circuits · intermediate · Editorial previewIn physics — Electrical circuits: A resistor of 13 Ω carries 12 A of current. Find the voltage.+
V = IR = 12 × 13 = 156 volts, assuming Ohm's law applies.
09Electric power · foundation · Editorial previewIn physics — Electric power: A device operates at 200 volts and draws 2 amperes. Find electrical power.+
P = VI = 200 × 2 = 400 watts.
10Density · advanced · Editorial previewIn physics — Density: A sample has mass 15256 g and volume 4 cm³. Find density.+
Density = mass/volume = 15256/4 = 3814 g/cm³.
11Wave frequency · intermediate · Editorial previewIn physics — Wave frequency: A wave has frequency 110 Hz and runs for 16 seconds. Find its period and total cycles.+
Period = 1/110 ≈ 0.009091 s; total cycles = frequency × time = 1760.
12Momentum · foundation · Editorial previewIn physics — Momentum: A 18 kg body moves at 6 m/s. Calculate its momentum.+
Momentum p = mv = 18 × 6 = 108 kg·m/s.
13Pressure · foundation · Editorial previewIn physics — Pressure: A force of 1296 N acts over an area of 2 m². Find pressure.+
Pressure = force/area = 1296/2 = 648 pascals.
14Kinetic energy · intermediate · Editorial previewIn physics — Kinetic energy: Find the kinetic energy of a 18 kg object moving at 3 m/s.+
KE = 1/2 mv² = 1/2 × 18 × 3² = 81 joules.
15Gravitational potential energy · advanced · Editorial previewIn physics — Gravitational potential energy: Using g = 10 m/s², find gravitational potential energy of a 16 kg mass raised 10 m.+
PE = mgh = 16 × 10 × 10 = 1600 joules.
16Measurement · foundation · Editorial previewIn physics — Measurement: Convert 2481 kilometres to metres.+
1 km = 1000 m, so 2481 km = 2481000 metres.
17Motion · intermediate · Editorial previewIn physics — Motion: A vehicle travels at a constant 3092 km/h for 7 hours. How far does it travel?+
Distance = speed × time = 3092 × 7 = 21644 km.
18Newton's laws · foundation · Editorial previewIn physics — Newton's laws: An object of mass 14 kg accelerates at 14 m/s². Find the net force.+
Newton's second law: F = ma = 14 × 14 = 196 newtons.
This is an educational practice preview. Answers and board-specific alignment are undergoing editorial review; these are not official exam questions.