# Shared Flashcard Set

## Details

Chapter 2
Kinematics in One Dimension
32
Physics
01/08/2015

Term
 kinematics
Definition
 deals with the concepts that are needed to describe motion, without any reference to forces
Term
 dynamics
Definition
 deals with the effect that forces have on motion
Term
 mechanics
Definition
 the branch of physics that is formed by kinematics & dynamics
Term
 displacement
Definition
 a vector drawn from the original position to the final position of an object; denoted with a delta in front of the vector; magnitude equals the shortest distance between the two positions
Term
 SI unit of displacement
Definition
 meter (m)
Term
 average speed
Definition
 the distance traveled divided by the time required to cover the distance
Term
 average velocity
Definition
 dividing the displacement by the elapsed time
Term
 SI unit for average velocity
Definition
 meter per second
Term
 instantaneous velocity/velocity
Definition
 how fast an object moves & the direction of the motion at each instant in time
Term
 instantaneous speed/speed
Definition
 the magnitude of the instantaneous velocity
Term
 equation for instantaneous velocity
Definition
 limit as change in time approaches zero of displacement/change in time
Term
 As the change in time approaches zero in the equation for instantaneous velocity, what happens to the velocity?
Definition
 approaches the value of the instantaneous velocity
Term
 average acceleration
Definition
 change in velocity/elapsed time
Term
 SI unit of average acceleration
Definition
 meter per second squared
Term
 Does the vector for average acceleration point in the same direction as the vector for velocity when the object is speeding up?
Definition
 yes!
Term
 instantaneous acceleration/acceleration
Definition
 an object's acceleration at a particular instant of time; limit as change in time approaches zero of change in velocity/change in time
Term
 Does the vector for average acceleration point in the same direction as the vector for velocity when the object is slowing down?
Definition
 no!
Term
 In kinematics, what does "x" stand for?
Definition
 displacement
Term
 In kinematics, what does "a" or "a bar" stand for?
Definition
 constant acceleration
Term
 In kinematics, what does "v" stand for?
Definition
 final velocity at time "t"
Term
 In kinematics, what does "v knot" stand for?
Definition
 initial velocity at time "t knot" which is 0 seconds
Term
 In kinematics, what does "t" stand for?
Definition
 time elapsed since "t knot" which is 0 seconds
Term
 Under what conditions can the equations of kinematics be used?
Definition
 constant acceleration
Term
 free-fall
Definition
 an idealized motion of an object downwards towards the Earth in which air resistance is neglected & the acceleration is nearly constant
Term
 acceleration due to gravity
Definition
 the acceleration of a freely falling body; magnitude is denoted by "g"
Term
 What is "g" equal to in m/s^2?
Definition
 9.80 m/s^2
Term
 Does "freely falling" always mean that an object is falling down?
Definition
 no!
Term
 In any case of free fall, the object always experiences the same _____ due to gravity
Definition
 downward acceleration
Term
 What does the slope of position/time equal to for an object?
Definition
 its velocity
Term
 If an object is accelerating, what is changing?
Definition
 its velocity
Term
 What does the slope of the line tangent to the position/time curve equal for an object?
Definition
 its instantaneous velocity
Term
 What is the slope of the velocity/time curve equal to for an object?
Definition
 its acceleration
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