midterm Flashcards
Definition of Motion
the change of a position of an object with respect to time
In order to describe motion you must specifify parameters such as
Displacement and Time
Definition of Vectors
Parameters that have a numerical value in a specific direction
Definition of Scalar
Parameters that have numerical values but no direction’s needed
Definition of Speed/Rate
A scalar quantity that measures the distance traveled over the change in time
Rate of motion or how fast something’s going
Symbol for Speed/Rate
V or r (sometimes)
Equation for Speed/Rate
V= d/t
Unit for speed/rate
m/s
Definition of Velocity
A vector quantity that measures displacement over the change in time
Tells speed and direction
Symbol for Velocity
V (same as speed/rate)
Equation for velocity
V= d/t (same as speed/rate)
Unit for Velocity
m/s in any given direction
Definition of Acceleration
The rate of change in speed with time
The rate at which an object changed its velocity
Symbol for Acceleration
a
Equation for acceleration
a = Vf- Vi / t
Unit for acceleration
m/s squared
Definition of force
A vector quantity defined as a push or pull on an object
Symbol for force
F
Unit for force
N (Newton) and 1N = 1kg m/s squared
Equation for force
F = m * a
Definition of gravity
earth’s surrounded by its own gravitational field which exerts a constant force on all objects towards it (attractive)
Law of acceleration of gravity
An object free-falling near the earths surface increases its velocity at a rate of 9.8 m/s for each second of its descent
Symbol for law of acceleration of gravity
g
Equation for law of acceleration of gravity
g = 9.8 m/s squared
Definition for Velocity of a free-falling object
Free-falling objects are in a state of acceleration at a rate of 9.8 m/s squared
Its velocity is dependent upon the time its fallen
The distance of a free-falling object is dependent upon…
the time it has fallen
Formula for Distance covered by a free-falling object
d = .5 * g * t squared
Definition of work
A force applied to an object causing its motion (displacement)
Must be a displacement of the object caused by force to be qualified as work
Symbol for work
W
Equation for work
W = f * d
Unit for work
N*m = Joule (j)
Definition for Energy
The ability to do work
Definition for power
The rate at which work is done
Time it takes to do the work
Symbol for power
P
Equation for power
P = w/t
