Physics Exam — Newton's Laws, Speed, Gravity and Pressure
Review the fundamentals of mechanics: what a force is and how it is measured, Newton's three laws, the difference between mass and weight, average speed, gravity, friction, pressure and Archimedes' principle. Multiple-choice questions with detailed explanations.
Physics & Chemistry · Primary & Secondary
Mass (kg) is the amount of matter and does not change. Weight (N) is the gravitational force on that mass and varies with location — 6× less on the Moon.
1st: inertia — objects resist change. 2nd: F = m × a. 3rd: action-reaction — every force has an equal and opposite counterpart. These three laws describe all everyday motion.
P = F/A (Pascals). The smaller the area, the greater the pressure. Archimedes' principle explains why steel ships float and how submarines control their depth.
"A Year 9 student applies F = m × a to work out that a 5 kg object pushed with 20 N accelerates at 4 m/s². The exam makes the formula concrete."
Tricks and techniques to master this topic faster:
Unit check: force in Newtons (N), mass in kg, acceleration in m/s². Always verify units.
Weight = mass × g. Use g ≈ 10 m/s² in school calculations for simplicity.
In action-reaction pairs, the forces act on DIFFERENT bodies — they never cancel each other.
Pressure tip: a knife cuts because its thin blade concentrates all the force on a tiny area.
If you are studying Forces and Motion, these curriculum topics complement each other:
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