L19 Flashcards
The mass of an object is richly related to:
It’s resistance to change motion and Inertia
In the absence of external forces, the total momentum of a given system
Remains constant
-only external forces will change the motion of a system
Impulse
Linear impulse is the product of a force and the time interval over which a force acts
Impulse= force times time
Force=
Mass x acceleration
Or
Mass x velocity/ time
Impulse equals
Force x time
Impulse can also equal
Change in momentum (P)
Impulse can increase or decrease what
Momentum
From an injury prevention perspective, do you want to increase or decrease impulse duration when landing from a jump
Increase
-softens landing over more time
Contact
Push or pull of an object in direct contact with another object
Non contact
No direct contact with the object
-gravity
The attractive force of the earth on an object is called the
Weight of an object
W=mass x accceleration (being gravity)
GRF in the plane of motion (anterior/ posterior)
Propulsive Force: a force that is causing a body to speed up
Breaking force: a force that is causing a body to slow down
