Question | Answer |
ILS Ch 12 Review | |
Newton’s Laws | |
First | object in motion stays in motion, at rest stays at rest |
Second | f = m X acc (acc= force/mass) |
Third | action reaction forces |
Force | push or pull |
Equation | force= mass X acc |
Label | Newton (1 kg m/s/s) |
Momentum | |
Equation | Mo= mass X vel |
Tides | caused by gravity from the moon |
Universal Forces | |
Gravitational | force pulling down, effective over long distances, depends on mass and distance |
Electromagnetic | repulsion of similar charges, opp attract |
Strong nuclear | Protons and neutrons |
Weak nuclear | nuclear decay |
Projectile Motion | initial forward velocity and pull of gravity |
Ex: diagram | |
Friction | force that opposes motion |
Types | fluid (fish), sliding, static, rolling |
Ex: | |
Strengths | static is stronger than sliding |
Law of Conservation Momentum | momentum is conserved when objects collide in a closed system, loss of momentum by one object equals gain of momentum by another |
Weight | W=M X Acc due to gravity, less gravity = less weight |
Inertia | resistance of changes in motion |
Air Resistance | force pushing up on a falling object, increases with surface area, drag force |
Terminal Velocity | net force = zero |
Balance Forces | net force = zero |
Net Forces | sum of all forces acting on an object |
Unbalanced Forces | causes acceleration |
Centripetal Force | |
Satellites | acts as unbalanced force, changes direction, center directed force |
Gravity | Mass and distance |