PHSX 114 Exam 2
1. A free-body diagram shows the forces acting upon an object. How is that object represented in a diagram?:
A single point
2. Which quantity can cause changes in motion instead of being a property of motion?: Force
3. Two forces acting upon an object are perpendicular to one another. How would you draw these in a free-
body diagram?: Two force arrows will be drawn at a right angle of one another.
4. Before we understood that objects have a tendency to maintain their ve- locity in a straight line unless
acted upon by a net force, people thought that objects have a tendency to stop on their own. This happened
because
a specific force was not yet understood. What was that force?: Frictional force
5. What is mass? What does it depend on?: Mass is the quantity of matter contained in an object and depends on the
number and types of atoms in the object
6. A car travels at 60km/hr. In 30s, it slows down to 20km/h. True or false: the care accelerated during this
period?: True
7. What does Newton's first law state?: A body at rest tends to remain at rest and a body in motion tends to remain in
motion at a constant velocity unless acted on by a net external force.
8. True or false: If you want to reduce the acceleration of an object to half its original value, then you would
need to reduce the net external force by half.: True
9. Which of the following is an example of a body exerting a force on itself?
-A person standing up from a seated position
-A car acceleration while driving
-Both of the above
-None of the above: -None of the above
10.If a constant, nonzero force is applied to an object that is at rest, what can you say about the velocity and
acceleration of the object as the force is applied?: Velocity changes, acceleration remains constant
11.A passenger on a moving train tosses a ball straight up into the air and catches it. True or false: in
relation to a person standing still on a platform outside the train, the ball only has vertical velocity.: False
12.True or False: A person walks 2 blocks east and 5 blocks north. Another person walks 5 blocks north and 2
blocks east. The displacement of the first person is different from the displacement of the second person.: False
13.What expression shows the x-component of R=A+B: Rx=Ax+Bx
14.When you take off in a jet aircraft, there is a sensation of being pushed back in the seat. Is there a force
pushing you backward?: No
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1. A free-body diagram shows the forces acting upon an object. How is that object represented in a diagram?:
A single point
2. Which quantity can cause changes in motion instead of being a property of motion?: Force
3. Two forces acting upon an object are perpendicular to one another. How would you draw these in a free-
body diagram?: Two force arrows will be drawn at a right angle of one another.
4. Before we understood that objects have a tendency to maintain their ve- locity in a straight line unless
acted upon by a net force, people thought that objects have a tendency to stop on their own. This happened
because
a specific force was not yet understood. What was that force?: Frictional force
5. What is mass? What does it depend on?: Mass is the quantity of matter contained in an object and depends on the
number and types of atoms in the object
6. A car travels at 60km/hr. In 30s, it slows down to 20km/h. True or false: the care accelerated during this
period?: True
7. What does Newton's first law state?: A body at rest tends to remain at rest and a body in motion tends to remain in
motion at a constant velocity unless acted on by a net external force.
8. True or false: If you want to reduce the acceleration of an object to half its original value, then you would
need to reduce the net external force by half.: True
9. Which of the following is an example of a body exerting a force on itself?
-A person standing up from a seated position
-A car acceleration while driving
-Both of the above
-None of the above: -None of the above
10.If a constant, nonzero force is applied to an object that is at rest, what can you say about the velocity and
acceleration of the object as the force is applied?: Velocity changes, acceleration remains constant
11.A passenger on a moving train tosses a ball straight up into the air and catches it. True or false: in
relation to a person standing still on a platform outside the train, the ball only has vertical velocity.: False
12.True or False: A person walks 2 blocks east and 5 blocks north. Another person walks 5 blocks north and 2
blocks east. The displacement of the first person is different from the displacement of the second person.: False
13.What expression shows the x-component of R=A+B: Rx=Ax+Bx
14.When you take off in a jet aircraft, there is a sensation of being pushed back in the seat. Is there a force
pushing you backward?: No
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