Linear Momentum: Impulse, Conservation & Collisions
Unit 4: Linear momentum · 4 min · Watch on YouTube · 30-second version
Exam prep · AP Physics 1
AP Physics 1 asks you to reason with equations more than compute with them. Flashcards work when the front is a situation (“block on a frictionless incline, released from rest”) and the back is the model that applies. Start with the free mechanics and circuits decks below, then build cards from your own labs and notes.
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Unit 4: Linear momentum · 4 min · Watch on YouTube · 30-second version
State Newton's third law.
Answer: For every action force there is an equal and opposite reaction force on the other object.
The two forces act on different objects, so they don't cancel.
Momentum formula and its conservation
Answer: p = mv; in a closed system total momentum before a collision equals total momentum after.
Impulse J = FΔt = Δp.
State conservation of mechanical energy.
Answer: Without friction or air resistance, KE + PE stays constant.
Energy converts between kinetic and potential forms.
Gravitational potential energy formula
Answer: PE = mgh
h measured from a chosen reference level.
Kinetic energy formula
Answer: KE = ½mv²
Doubling speed quadruples kinetic energy.
Define work in physics.
Answer: W = F · d · cosθ, the force times the displacement in the direction of the force.
Units: joules. No displacement, no work.
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No. The revised AP Physics 1 course (from 2024-25) covers mechanics, oscillations and fluids. Circuits moved to AP Physics 2, but the circuits deck below is still useful if your class covers them.
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Official information: College Board: AP Physics 1. Formats and weights change; check the official page before test day.
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