Subjects › Mechanics

Newton's laws

Forces, inertia, and why nothing needs a push to keep moving.

The idea

Aristotelian intuition — that motion requires a continuing force — is the most robust misconception in physics education and survives most instruction. Confronting it directly works better than working around it.

Lesson

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Questions (4)

Question Type Difficulty Drift Accuracy
A spacecraft drifts through deep space with its engines off, far from any star. What happens to it? mcq Moderate -0.20 — — (0)
A net force of 12 N acts on a 4 kg mass. What is the acceleration in m/s²? numeric Moderate 0.10 — — (0)
A book rests on a table. Which pair of forces are a Newton's-third-law action–reaction pair? mcq Hard 0.80 — — (0)
A 2.0 kg block is pulled along a horizontal surface by a 10 N horizontal force. Friction opposes the motion wi… numeric Hard 1.20 — — (0)