Answers to Physics Module Questions - Module #3

  1. A freely falling object started from rest. 2 seconds later, its speed is about
    1. 5 m/s
    2. 10 m/s
    3. 15 m/s
    4. 20 m/s
    5. 25 m/s
    6. 30 m/s
    7. 35 m/s

  2. A base ball is hit straight up into the air at a speed of 20 m/s. How long does it take to reach the high-point in its trajectory.
    1. 1/2 seconds
    2. 1 second
    3. 2 seconds
    4. 4 seconds
    5. 5 seconds
    6. 10 seconds
    7. 20 seconds

  3. Galileo used inclined planes to ____ the effective acceleration (of a rolling cylinder or ball) compared to earth's gravity
    1. increase
    2. stop
    3. decrease
    4. keep the same
    5. none of the above
    6. all of the above

  4. A baseball is hit vertically upward at 30 m/s. One second later its speed is about ____ vertically upward.
    1. 30 m/s
    2. 35 m/s
    3. 40 m/s
    4. 25 m/s
    5. 20 m/s
    6. 15 m/s
    7. 10 m/s
    8. 0 m/s

  5. A ball is thrown upwards and caught once it comes back down. The speed of the ball as it returns and is caught is ___ if there is air resistance compared to if there were no air resistance.
    1. greater
    2. the same
    3. double
    4. zero
    5. infinite
    6. lower
    7. none of the above

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