Freshman Physics

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Freshman Physics

• Review game and test prep

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How to take a physics test

• Dont be nervous!
• Tell me what you knowyou can explain yourself in
  your own words in short answer and essay
  questions
• Read each multiple choice question carefully and
  consider each answer
• Choose the best response

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Answering essay questions and solving problems

• Read the question!
• Look for key words in essay questions like
  compare and contrast, define, explain, explain,
  etc.
• Look for what the problem is asking you to solve.
  Find/remember equations that help to solve for
  what the problem is asking.
• Be thorough. Explain yourself well by being
  organized. Plan out essay questions before you
  begin writing. Be sure to label all answers with
  appropriate units (m/s).
• Write neatly! Show all work!

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What is the scientific method?

• A way of finding the answers we have about the
  world around us in a logical wayorganized common
  sense.

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What are the steps of the scientific method?

• Recognize a problem
• Make an educated guess
• Test and experiment
• Record data/analyze results
• Make a simple conclusion

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Distinguish among theory, hypothesis, and law.

• A theory is a statement based on hypotheses that
  hasnt been proven wrong. (i.e. the theory of
  evolution)
• A hypothesis is an educated guess
• A law is a statement of a hypothesis that has
  been tested repeatedly and never contradicted.

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What do we mean when we say that motion is
relative?

• All things, even those that appear to be at rest,
  are moving at 30 km/s relative to the sun. This
  happens because earth is moving around an orbit
  and so the things on earth are always moving with
  it
• Motion is relative to the environment. Cars
  travel at 60 mi/h relative to the road they are
  traveling on.

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What is a rate

• A rate is something divided by time

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Define speed

• Speed is distance divided by time (think about
  how fast you go in a caryou talk about miles
  (distance) per hour (time))

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What is velocity?

• Velocity is speed in a given direction

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Explain what it means for an object to accelerate.

• If an object is accelerating, it means that for
  every second, the speed and/or direction of that
  object is changing.

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What is g?

• G is the acceleration due to gravity. Its value
  is approximately 10 m/s/s
• To find the instantaneous speed of objects
  falling from rest, vgt

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How do we calculate the distance of freely
falling objects?

• We must take into account the objects average
  speed. When falling one second from rest, an
  object only travels 5 metersthe formula dvt
  holds true when v average speed
• D1/2gt2 is another way to calculate distance for
  objects not falling from rest

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