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This is the Exam of Introduction to Physics which includes Magnitude of Acceleration, Net Force, Inferred About Force, Accelerate Without Changing Speed, Terms of Energy, Indicated Points, Frictionless Track etc. Key important points are: Scientific Method, Appropriate Method, Oxygen Molecules, Type of Number, Acceleration and Time, Distance and Displacement, Function of Time, Velocity Axis, Mathematically Describe Motion
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St. Vincent College PH 103: Introduction to Physics
The exam consists of 4 questions. There will be 50 minutes to complete the exam. The questions may not be worth the same number of points, read the entire exam before beginning work. Put your name on all pages.
Problem 1 20
Problem 2 25 Problem 3 20
Problem 4 25
Total 100
a) (10 pts) Briefly explain whether or not the scientific method would be an appropriate method with which to answer the following questions. Be sure to state why you answered the way you did for each.
i. “Why is the sky blue?”
ii. “Did horses evolve?”
iii. “How is light scattered by oxygen molecules?”
iv. “At what angle would a pencil appear to be bent when placed part-way into a glass of water?”
b) (10 pts) Indicate which type of number (scalar or vector) the following quantities are (and why):
i. Acceleration
ii. Time
iii. Distance
iv. Displacement
a) (5 pts) By how much does the velocity of the child change during the 10 s trip down the hill?
b) (5 pts) What is the final velocity of the child upon reaching the bottom of the hill, 10 s after hopping on the sled?
c) (10 pts) How far did the child travel, while on the sled, to the bottom of the hill?
a) (10 pts) The change in the velocity of an object is the area under the acceleration vs. time plot. If the acceleration is constant, this works out to the area of a rectangle of width t and height a, or ∆v = at. Explain why the final velocity of the object is then given by
vf = vi + at
if vi is the initial velocity and vf is the final velocity.
b) (5 pts) In a similar manner, the change in the position of a moving object is given by the area under the velocity vs. time plot. In the following equation for final position, identify (circle, underline, etc.) the portion that corresponds to the mathematical expression for the change in position of a moving object with a constant acceleration:
xf = xi + vit +
at^2
c) (10 pts) Outline the process that you would follow to analyze the motion of an object thrown hori- zontally off the top of a cliff so that you could predict the horizontal position (measured from the base of the cliff) at which the object would impact.
