Unit 2 Flashcards
Any object with a constant velocity has…
…no acceleration
any object that IS experiencing an acceleration (of any kind) must have a…
…net force acting on it.
acceleration equation
a = net force/mass = f/m (m/s^2)
terminal speed
when air resistance and weight are in balance.
air resistance equation
a = Fnet/m = (mg-R)/m where mg is weight, R is air resistance
What causes an object to accelerate?
Unbalanced forces acting on an object.
acceleration is directly proportional to…
net force
acceleration is inversely proportional to…
1/mass
The force of friction between surfaces depends on…
the kinds of material in contact and how much the surfaces are pressed together.
pressure equation
pressure = force/area of application. Measured in pascals (Pa).
air resistance
air resistance force ~ speed * front area
terminal velocity
when terminal speed is together with the direction of motion.
Force is always part of…
a mutual action that involves another (equal and opposite) force. Action/reaction forces.
Action and reaction forces are…
equal in strength and opposite in direction
Lift
The upward force that causes helicopters, birds, and airplanes to fly
Newton’s Second Law
The acceleration of an object is proportional to the net force on the object and inversely proportional to the object’s mass.
Force equation
F=ma = m*[(v1-v2)/t]
