Bookmark & Share
Study
Review All|
Force |
any kind of push or pull on an object |
|
Newton's First Law |
Object at rest stays at rest until force acts upon it. Object in motion stays in motion until a force acts upon it. |
|
inertia |
tendency for objects to remain in current state of motion |
|
inertial reference frame |
Newton's laws are only valid in this type of reference frame - NO ACCELERATION |
|
Mass |
measure of inertia of an object |
|
Newton's Second Law |
Fnet = MA |
|
Slug |
British unit of mass |
|
Newton's Third Law |
Equal and opposite force |
|
Weight |
force of gravity upon an object |
|
Friction |
force that opposes motion |
|
coefficient of static friction |
ratio of static friction to normal force |
|
coefficient of kinetic friction |
ratio of kinetic friction to normal force |
|
air resistance |
opposes motion in air |
|
momentum |
related to inertia - property that allow objects to continue in current state of motion p = mv *conserved if system is isolated |
|
impulse |
change of momentum; same units as momentum = F(net) * change in time longer time = less force |
|
When is momentum conserved? |
In an isolated system |
|
Elastic collision |
Objects bounce off of each other; retain original shape *P and K are conserved |
|
What is conserved in elastic collisions? |
momentum and kinetic energy |
|
Inelastic collisions |
Kinetic energy is NOT conserved objects conserve momentum |
|
Comletely/perfectly inelastic collisions |
Objects stick together; momentum is conserved (NOT kinetic energy) |
|
Can colliding objects have more energy after a collision? |
NO - only the same (elastic) or less (inelastic) |
|
center of mass |
acts as if all of the mass is gathered at that point; used to determine whether things will be stable i.e. if center of mass is drawn and doesn't go thru truck's tires, it will overturn |
