Mechanics Flashcards
Newton’s first law
an object in motion will remain in motion unless acted upon by an unbalanced force
Newton’s second law
force=mass x acceleratoin
Newton’s third law
when one object exerts a force on a second object, the second object exerts an equal force in the opposite direction of the first object
ex; a canon moving backwards after shotting a bomb
Inertla
the tendency of an object to resist a change in motion
ex; a passenger will launch forward if a car suddenly stops suddenly
What’s weight
the gravitational force experienced by an object
Formula of weight
Fg=mg
g=(9.8)
Whats apparent weight
the force exerted by the scale
How does going up or down an elevator affect apparent weight
accelerating upwards:
feel heavier, scale reads less
accelerating downwards:
feel lighter, scale reads more
what’s drag force
the force exerted by a fluid on an object opposing motion through a fluid
what’s terminal velocity
the constant velocity that’s reached when the drag force equals the force of gravity Fg=Fd
what’s normal force
the prepindicular contact force that a surface exerts on another surface
what’s the resultant of two equivalent vectors in opposite directions
the resultant is zero
Formula for resultant of two prepindicular vectors
R^2=A^2+B^2
Formula for resultant of two prepindicular vectors with an angle between them
R^2=A^2+B^2-2ABcosthta
what’s friction force and its two types
opposing force between two surfaces in contact
1.kinetic
2.static
