Newton's laws, friction, free-body diagrams.
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Q1 · Laws of Motion (Class 11) · EASY
A body of mass 5 kg is acted upon by a net force of 20 N. What is its acceleration?
Q2 · Laws of Motion (Class 11) · HARD
A block of mass 10 kg rests on a horizontal surface. The coefficient of static friction is 0.4 and kinetic friction is 0.3. What minimum horizontal force is required to just start moving the block? (Take g = 10 m/s²)
Q3 · Laws of Motion (Class 11) · MEDIUM
Two blocks of masses 2 kg and 3 kg are connected by a string passing over a frictionless pulley. What is the acceleration of the system? (Take g = 10 m/s²)