Linear kinetics/ angular kinetics Flashcards
(20 cards)
law of inertia
A body in motion tends to remain in motion, a body at rest tends to remain at rest
Law of acceleration
An objects acceleration is equal to the net force divided by the mass of the object
The acceleration of an object is dependent on these two things
- The net force acting upon the object
2. The mass of the object
what does momentum equal
mass x velocity
What does impulse equal
force x time
two types of forces
contact
non contact
Ground reaction force- body weight- which direction has the highest GRF
scaled by dividing the force component by the body weight
-verticle (walking, running)
ant- post GRF magnitude
-similar shape of verticle but has lower magnitudes
What is Joint reaction force
- based on newtons 3rd law
- Net force acting across a joint
What are the 2 forces that change the amount of friction
- coefficient of friction
2. Normal force (force perpendicular to object force)
features of translational friction ( vs static)
The coefficient of friction is higher when static then when in motion
intitial force
Inertia is the resistance of any physical object to any change in its velocity.
Work force
product of magnitude of force applied parallel to displacement against an object
what is energy and what are the 2 forms
-energy is capacity to do work
- Kinetic energy
- Potential energy
What is power
rate at which a force does work
Power= change in work/ change in time
radius of gyration
center of mass
How is angular momentum calculated
angular momentum= moment of inertia * Angular velocity
When figure skaters tuck their arms in the moment of inertia goes down so their angular velocity must go up (since angular momentum is determined at take off)
Law of angular momentum
A rotating body will continue in a state of uniform angular motion unless acted on by an external torque
Law of angular acceleration
An external torque will produce an angular acceleration of a body that is proportional to and in the direction of the torque
Law of action reaction
For every torque exerted by one body on another their is an equal and opposite torque exerted on the latter body
