Chapter 2 - Linear Kinematics Part 1 (Week 2) Flashcards
(22 cards)
What is linear motion?
Change in position when all points on an object move the same distance, in the same direction, at the same time
What are the two main types of linear motion?
Rectilinear motion and curvilinear motion
What is rectilinear motion, and an example?
The object maintains orientation during movement so all points on object move same distance, same direction, same time, in straight lines
Example: sprinter running straight down a 100-meter track
What is curvilinear motion and an example?
Object maintains orientation during moement so all points on an object move same distance, same direction, same time, but not straight line
Example: basketball shot in an arc
- Gymnast doing a backflip?
What is angular motion?
All points on body or object move in circles about the same fixed central line or axis
What is general motion? Example?
combination of linear and angular motions
Example: Biking - lower extremity joints have angular motion, trunk and body have linear motion
What is linear kinematics? What description does it use to describe linear motion
describes linear motion
- uses speed, distance, and direction to describe
What is the distance traveled?
Measure of length of path followed by the object whose motion is being described, from start position to end position
What is displacement?
Straight line distance in a specific direction from the starting position to end position
Example: walk 4 meters north, your displacement is 4 meters north
What is resultant displacement?
distance measured in straight line from start position to final position
Example: 1. walk 3 meters east
2. then 4 meters north
using pythagorean theorem
What is speed? What are the units?
rate of motion, rate of distance traveled
m/s
What is the average speed? What is the formula?
The distance object traveled is divided by the time to travel that distance
S = l/Δt
l = total distance traveled
Δt = change in time (final time - initial time)
What is instantaneous speed?
Speed of an object at a specific instant of time
What is velocity? Units: m/s
Rate of motion in a specific direction
What is the average velocity? What is the formula?
Displacement of an object divided by the time it took for that displacement
Formula: V = d/Δt
What is instantaneous velocity?
Velocity of an object at an instant in time
What is acceleration?
Rate of change of velocity
What motions are considered acceleration?
Objects that
- speed ups,
- slows down,
- starts,
- stops,
- or changes direction
Why does the direction of motion does NOT indicate the direction of acceleration
Becuase acceleration is NOT about where you’re going but how your velocity is changing
- Acceleration is the rate of change of velocity
- It depends on how the velocity changes - not on the direction of motion itself
What is the average acceleration?
Change in velocity divdied by time it took for that velocity change to occur
a =Δv/Δt = Vf - vi/Δt
What is instantaneous acceleration?
Acceleration of an object at an instant in time
Acceleration Table
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