Biom.3 Flashcards
Center of mass
Mass of an object is usually represented as a point located at the center
Define inertia
Resistance to acceleration
Directly proportional to mass
Has no unit of measurement
Types of forces are
Internal & external
Application of internal force are
Forces acting within an object
Do not cause a change in CM
Muscles produce force with the body
Application of external force
Forces are acting on an object
Can cause a change in CM
GRAVITY, magnetic, friction are examples
Define gravity
The pull of attraction between two masses
Define friction
A force which acts at the contact between surfaces in the opposite direction
Contact force
Force due to contact between surfaces
Define dynamic fluid force
Due to the relative motion between object and fluid
What is first law?
If no external force acts on a body then it’s velocity will remain constant
You need a force to change an objects_______
Velocity
For first law if velocity changes then what happens
Change in speed only
Change in direction only
Change in both
If velocity changes then?
Net force has acted on the object
Define second law
In order to produce the same acceleration for a more massive object you need a larger force
Define weight
Measure of graviton nap attraction to the earth
Define three law
For every act there is an equal and opposite reaction
Application of first law is
The force that act upon an object flight
Application of second law
By knowing the mass of an object and the desired acceleration, the force used to accelerate the object can be calculated
Application of third law
The force that you exert on the ground must be exerted back on you
Which law is used the most?
Second law
What is mass
A measure of the quantity of matter composing an object.
Measured in kg
