CH 10 Linear Motion Flashcards
What is the definition of Kinematics?
The form, pattern, or sequencings of movement with respect to time; the appearance of a motion
What is displacement?
-Change in location or position
- The directed distance from initial to final location
- the vector equivalent of linear distance
Displacement will always be __ or equal to the distance.
less than
Speed formula
Speed = (Distance/Time)
What are the units for speed?
Length/time
Velocity Formula
V= (displacement/time)
What are the units of velocity?
Length/time
If direction is positive, then velocity is___?
positive
If direction is negative, then velocity is ___?
Negative
What does a change in velocity represent?
A change in speed, direction, or both
What is velocity in running?
stride frequency x stride length
What is a running stride?
two consecutive steps
How do distance runners increase velocity?
Increasing stride length
How do sprinters increase velocity?
Increasing stride frequency
What is the definition of pace?
Inverse of Speed
How is pace represented?
10 minute mile, 6.4 s 40 yd dash
What is the definition of acceleration?
- the rate of change in linear velocity
- change in speed and/or direction
Formula for acceleration
a = (change in velocity/change in time)
If velocity is 0 m/s, does that mean that acceleration is also 0 m/s/s?
No, acceleration always includes the force of gravity
What is average velocity?
The velocity over an entire section/time period, etc
What is the purpose of finding average velocity?
It determines the winner of a race
What is instantaneous velocity?
The velocity at a specific point
What is the purpose of finding instantaneous velocity?
It helps to analyze a specific phase or section of an event
Speeding up in a positive direction
positive acceleration
