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A past exam from st. Vincent college's ph 103: introduction to physics course, dated march 2, 2005. The exam consists of 4 questions with a total of 100 points. Questions cover topics such as forces, newton's laws, and energy. Students are expected to demonstrate an understanding of concepts related to these topics.
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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 30
Problem 2 20 Problem 3 25
Problem 4 25
Total 100
a) (10 pts) List two forces that would be considered “field” forces.
b) (10 pts) List two forces that would be considered “contact” forces.
c) (5 pts) Newton’s 1st Law states that if an object is not interacting with anything else, it will not accelerate. Is it possible for an object to be interacting with other object(s) (ie. there are forces acting on the object) yet still have no acceleration? Briefly explain the reasoning behind your answer.
d) (5 pts) A book is sitting at rest on a desktop. The earth is exerting a downward gravitational force on the book. What is the 3rd Law reaction force to the earth’s gravitational attraction of the book?
10 kg
15 N 5 N
a) (5 pts) What is the magnitude and direction of the net force on the box shown in the figure above?
b) (5 pts) What would be the acceleration of the box? And in what direction will the box accelerate?
c) (5 pts) How much work is done on the box as it slides 20 m by (i) the 15 N force and (ii) the 5 N force? Assume that the box started at rest.
d) (5 pts) What is the net work done as the box moves 20 m? (ie. by how much does the energy of the box increase during this motion?)
e) (5 pts) What form will this additional energy take after being transferred to the box?
a) (5 pts) In what form is the energy of the earth-skier system when the skier is at the top of the hill (at rest)? Calculate the numeric amount of this energy.
b) (5 pts) What happens to the energy of the earth-skier system as the skier slides down the hill (with no friction)?
c) (5 pts) How much energy does the earth-skier system have when the skier reaches the bottom of the hill? (I am looking for a number here.)
d) (5 pts) How would your answer to (c) change if there was friction? (This time, I am looking for an explanation, not a number .)
e) (5 pts) There is a force exerted on the skier by the surface of the hill. Why does this force do no work on the skier as they slide down the hill?
