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Unit 4 · Physics · Study guidefrom 7 files

Motion in one direction

Start here — your weak spot. You've missed “acceleration at the top” three times. This guide opens on it.
VelocityAccelerationFree fallGraphs

Velocity is speed with a direction. Acceleration is how fast velocity changes. Near Earth everything falls with g = 9.8 m/s², pointing down, the whole way.

The trap: “At the top, the ball stops, so acceleration is zero.” Wrong — v = 0 for an instant, but a is still −9.8 m/s².
VelocityHow fast, which way
Can be zero
AccelerationHow v is changing
−9.8 the whole flight
Not in your files: air resistance. Your unit probably needs it — ask your teacher if it's on the test.
Quiz yourself · 14 questions1. A ball is thrown up at 14.7 m/s. When does it reach the top?2. True or false: zero velocity means zero acceleration.
Ask about this guide…
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Unit 4 · PhysicsReady · 1 page

Motion in one direction

VelocityAccelerationFree fall

Velocity is how fast and which way. Acceleration is how velocity changes. Near Earth, g = 9.8 m/s², pointing down, the whole flight.

The trap: at the top of a throw, v = 0 — but a is still −9.8 m/s².
14 quiz questions32 flashcards1 practice test
Retire the night before
the 40-tab research sessionQuizlet sets someone else madescreenshots of slidesthe group chat's “what's on the test”a Google Doc of pasted notesrereading the textbooka highlighter that never stopsthe night beforeone guide
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Unit 4 · Physics · Study guidefrom 7 files

Motion in one direction

Start here — your weak spot. You've missed “acceleration at the top” three times. This guide opens on it.
VelocityAccelerationFree fallGraphs

Velocity is speed with a direction. Acceleration is how fast velocity changes. Near Earth everything falls with g = 9.8 m/s², pointing down, the whole way.

The trap: “At the top, the ball stops, so acceleration is zero.” Wrong — v = 0 for an instant, but a is still −9.8 m/s².
VelocityHow fast, which way
Can be zero
AccelerationHow v is changing
−9.8 the whole flight
Not in your files: air resistance. Your unit probably needs it — ask your teacher if it's on the test.
Quiz yourself · 14 questions1. A ball is thrown up at 14.7 m/s. When does it reach the top?2. True or false: zero velocity means zero acceleration.
Ask about this guide…
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4 daysReread the guide · 12 min
3 days18 cards due · match-up
2 daysPractice test, timed
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