Lecture 17 Flashcards
What causes a change in energy of an object
The work done by the external forces acting on the object
What is the Work equation and what does it also equal
W = Average Force x displacement
Also = delta Energy
A large change in kinetic energy requires that a large force be applied…
Example
Over a long distance
Throwing ball with wrist vs whole arm
What are some examples of reducing KE
Catching a ball
Soft landing vs stiff landing
To reduce impact force we can…
Increase the force application distance to reduce potential injury
What is power
Rate of doing work
How much work is done in a specific amount of time
P = W / delta t
Power can be defined as average force times…
Average velocity along the line of action of that force
Power is a constraint of…
Movement
Duration of the activity influences the…
Sustainable power output of an individual
What is center of mass
A point at which the bodys mass is evenly distributed and is assumed to be concentrated
If the object comprises of multiple individual components, where is the center of mass in Symmetric and Asymmetric distribution
COM in middle of Symmetric
COM closer to larger weight in Asymmetric
What is the whole body Center mass total in 1 dimension
m1x1 + m2x2 etc/m1 + m2 etc
