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Newton's Second Law

Change force and mass. Watch acceleration respond.

Follow the mechanism1 / 3

Forces act on a system. Pushes and opposing forces combine into one net force rather than acting as isolated facts.

net force modelaccelerating right · Fₙₑₜ = m a
Focus the idea
Net force, mass, and accelerationA 10 kilogram block has an applied force of 50 newtons and an opposing force of 10 newtons. The net force is 40 newtons and the acceleration is 4.0 meters per second squared.10 kgapplied 50 Nopposing 10 Nafter 0.0 s: v = 0.0 m/s · Δx = 0.0 m
net force40 N
mass10 kg
acceleration4.00 m/s²
after 1 s4.0 m/s

After one second, the model predicts v = 4.0 m/s from rest.

Acceleration responds to net force, not one isolated push. The opposing force is a generic steady push to the left (not friction), so on its own it accelerates the block left. Change it until the arrows balance, then test what happens when mass changes.

04 / PRACTICE

Make the idea yours.

0 / 3 checked

Use the model, then answer without looking back. Each check isolates one decision a learner should be able to make after this lesson.

CHECK 1 / 3

A 6 kg block has a 30 N push to the right and a 12 N opposing force. What is its acceleration?