Physical Science Module #9 Summary
Ever science relies on the science of physics. As a result, we call it the most
fundamental of all the sciences. The science of mechanics is the branch of physics that
deals with analyzing and understanding objects in motion, the forces that are applied to
those objects, and the energy that exists in them. - ANSWER-
When studying motion, one must define a reference point, which is a point against
which position is measured. If an object's position relative to this point is changing, the
object is in motion relative to that point. Because motion depends on the reference
point, all motion is relative. - ANSWER-
The units for speed and velocity are composed of a distance unit divided by a time unit.
In base metric units, speed is given in meters/sec. While speed simply tells you how
quickly an object is moving, velocity tells you how quickly an objects is moving and the
direction in which it moves. Thus, speed is a scalar quantity, while velocity is a vector
quantity. Speed can be calculated with the equation:
distance traveled
speed=_____________
time traveled
__________________ - ANSWER-
When objects travel in the same direction, their relative speed is the difference between
their individual speeds. When they travel in opposite directions, their relative speed is
the sum of their individual speeds. - ANSWER-
The time rate of change of an object's velocity is its acceleration. The units for this
quantity are composed of a distance unit divided by a time unit squared. In base metric
units, it is given in meters/sec 2sqd. It is a vector quantity, because it contains
directional information. It can be calculated with the equation:
final velocity - initial velocity
acceleration=_____________________
time
________________________________ - ANSWER-
An object with an unchanging speed can still have acceleration, provided that its
direction is changing. In physics, the term "acceleration" can also mean that an object is
slowing down, because acceleration is simply the change in velocity, and a decrease in
velocity is still change. If an object is speeding up, its acceleration is in the same
direction as its velocity. If it is slowing down, its acceleration is in the opposite direction
as compared to its velocity. - ANSWER-
When an object falls solely under the influence of gravity, we say that it is in free fall. In
such a situation, the acceleration is equal to 9.8 meters/second 2squared in metric units
and 32 feet/second 2squared in English units. This acceleration is independent of the
characteristics of the object. Thus, in true free fall, a feather and a bowling ball with fall
with the same acceleration. - ANSWER-
Ever science relies on the science of physics. As a result, we call it the most
fundamental of all the sciences. The science of mechanics is the branch of physics that
deals with analyzing and understanding objects in motion, the forces that are applied to
those objects, and the energy that exists in them. - ANSWER-
When studying motion, one must define a reference point, which is a point against
which position is measured. If an object's position relative to this point is changing, the
object is in motion relative to that point. Because motion depends on the reference
point, all motion is relative. - ANSWER-
The units for speed and velocity are composed of a distance unit divided by a time unit.
In base metric units, speed is given in meters/sec. While speed simply tells you how
quickly an object is moving, velocity tells you how quickly an objects is moving and the
direction in which it moves. Thus, speed is a scalar quantity, while velocity is a vector
quantity. Speed can be calculated with the equation:
distance traveled
speed=_____________
time traveled
__________________ - ANSWER-
When objects travel in the same direction, their relative speed is the difference between
their individual speeds. When they travel in opposite directions, their relative speed is
the sum of their individual speeds. - ANSWER-
The time rate of change of an object's velocity is its acceleration. The units for this
quantity are composed of a distance unit divided by a time unit squared. In base metric
units, it is given in meters/sec 2sqd. It is a vector quantity, because it contains
directional information. It can be calculated with the equation:
final velocity - initial velocity
acceleration=_____________________
time
________________________________ - ANSWER-
An object with an unchanging speed can still have acceleration, provided that its
direction is changing. In physics, the term "acceleration" can also mean that an object is
slowing down, because acceleration is simply the change in velocity, and a decrease in
velocity is still change. If an object is speeding up, its acceleration is in the same
direction as its velocity. If it is slowing down, its acceleration is in the opposite direction
as compared to its velocity. - ANSWER-
When an object falls solely under the influence of gravity, we say that it is in free fall. In
such a situation, the acceleration is equal to 9.8 meters/second 2squared in metric units
and 32 feet/second 2squared in English units. This acceleration is independent of the
characteristics of the object. Thus, in true free fall, a feather and a bowling ball with fall
with the same acceleration. - ANSWER-
