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PHYSICS FINAL EXAM REVIEW
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PHYSICS FINAL EXAM REVIEW
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PHYSICS FINAL EXAM REVIEWA force is needed to - Answers-change an objects state of motion
The combination of all forces acting on an object is called the - Answers-net force
When you hold a rock at rest in your hand, you are pushing upward on it with as much
force as Earth's gravity pulls down on it. The net force would be - Answers-zero on the
rock
The scientific unit of force is the newton-- - Answers-abbreviated N
Tension is a - Answers-stretching force
Weight is the force of gravity - Answers-acting downward on an object
A vector is an arrow that - Answers-represents the magnitude and direction of a
quantity.
A vector quantity is a quantity that needs both magnitude and - Answers-direction for a
complete description
-an example would be force
A scalar quantity is a - Answers-quantity that can be described by magnitude only and
has no direction. -time, area, and volume are scalar quantities
You can express the equilibrium rule mathematically as - Answers-(funky backwards E
letter)F=0
-e letter stands for the sum of
-f stands for forces
Mechanical Equilibrium is a - Answers-state wherein no physical changes occur; it is a
state of steadiness
Whenever the net force on an object is zero, the object is said to be in - Answers-
mechanical equilibrium
What is the Equilibrium Rule? - Answers-Whenever the net force on an object is zero,
the object is said to be in mechanical equilibrium
For a suspended object at rest, the forces acting upward on the object must be -
Answers-balanced by other forces acting downward to make the vector sum equal zero
For an object at rest on a horizontal surface, - Answers-the support force must equal the
objects weight
, A support force is the upward force - Answers-that balances the weight of an object on a
surface. A support force is often called the normal force
An upward support force is - Answers-positive and a downward weight is negative
-The weight of a book sitting on a table is a negative force
-The atoms squeeze
-The compressed atoms produce - Answers--that squeezes downward on the atoms of
the table
-upward on the book.
-the positive support force.
Objects at rest are said to be in - Answers-static equilibrium
Objects moving at constant speed in a straight line path are said to be in - Answers-
dynamic equilibrium
Equilibrium is a state of - Answers-no change
An object under the influence of only one force - Answers-cannot be in equilibrium
Only when there is no force at all, or when two or more forces combine to zero, can -
Answers-an object be in equilibrium
Both static equilibrium and dynamic equilibrium are examples of - Answers-mechanical
equilibrium
The Parallelogram Rule - Answers-to find the resultant of two nonparallel vectors,
construct a parallelogram wherein the two vectors are adjacent sides. The diagonal of
the parallelogram shows the resultant
Resultant - Answers-the sum of two or more vectors
Combining vectors is simple when they are parallel.
-If they are in the same direction
-If they are in opposite directions - Answers--they add
-they subtract
To find the resultant of nonparallel vectors - Answers-use the parallelogram rule
When applying the parallelogram rule to two perpendicular vectors that are equal in
magnitude - Answers--the parallelogram is a square.
The resultant is root 2, or 1.414, times one of the vectors
When an object is suspended at rest from two non-vertical ropes, there are three forces
acting on it: - Answers-1. a tension in the left rope,
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