3. Dynamics Flashcards
mass
property of an object that resists change in motion
Force formula
F = ma
acceleration and resultant force are
always in the same direction
define and use linear momentum
product of mass and velocity
define and use force
force equal to rate of change of momentum
Newton’s 1st law of motion
Newton’s 2nd law of motion
RESULTANT force on an object is proportional to/equal to the rate of change of momentum. (after subtracting forward AND frictional force this force is given)
Newton’s 3rd law of motion
weight
effect of a gravitational field on a mass
the weight of an object is equal to the product of its mass and the acceleration of free fall. W=mg
frictional forces and viscous/drag forces including air resistance
terminal (constant) velocity
objects moving against a resistive force may reach a terminal (constant) velocit
explain qualitatively the motion of objects in a uniform gravitational field with air resistance
principle of conservation of momentum
sum/total momentum of a system of bodies is constant or sum/total momentum before= sum/total momentum after
for an isolated system/ no resultant EXTERNAL force
apply the principle of conservation of momentum to solve simple problems, including elastic and inelastic interactions between objects in both one and two dimensions
consider both vertical and horizontal
elastic collision
total kinetic energy is conserved and the relative speed of approach is
equal to the relative speed of separation. u1-u2=v2-v1
what is always conserved
while momentum of a system is always conserved in interactions between objects, some change in kinetic energy may take place
