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If I can’t picture it I can’t understand it. -Albert Einstein

If I can’t picture it I can’t understand it. -Albert Einstein. Position vs Time. At what time is v<0? D Or choose [E], none of the points shown. At what time is a=0? E, but B is close and got credit. Or choose [E], none of the points shown. Velocity vs. Time.

richardrodriguez
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If I can’t picture it I can’t understand it. -Albert Einstein

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  1. If I can’t picture itI can’t understand it.-Albert Einstein

  2. Position vs Time At what time is v<0? D Or choose [E], none of the points shown. At what time is a=0? E, but B is close and got credit. Or choose [E], none of the points shown.

  3. Velocity vs. Time At what point is x=0? (displacement since t=0) Or choose [E], none of the points shown. C At what point is a<0? D Or choose [E], none of the points shown.

  4. Acceleration vs. Time t1 t2 This could possibly describe: A] a car pulls away (+x dir) from a stop sign at t=0, applies brakes t1 to t2 B] a car backs down an alley at const speed (-x dir), collides with a wall at the end of the alley at t1 C] a hot air balloon is falling (-x) at constant speed, opens vent to eject hot air at t1 D] a car moving at 40 mph at t=0 is coasting to a stop at t1; at that instant, the driver steps on the gas.

  5. Required Skills for Chapter 2 Memorize meanings of •avg velocity •avg speed •avg acceleration and be able to calculate from given info or a graph. Memorize meanings of •displacement •velocity (instantaneous) •acceleration “ and memorize the relationships between them. Derivatives (slopes) move down the list. Integrals (areas) move up the list (but only give !) Be able to sketch other two graphs, given any one. Sketch given description of motion. Be able to calculate and interpret slopes and areas from given info or graph. Be able to solve exactly all problems involving one constant acceleration, and recognize non-constant acceleration problems. Be able to solve ANY problem graphically, by counting boxes or measuring slope. Memorize: “releasing” or “dropping” an object does NOT change v.

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