| A | B |
|---|
| Newton I | If F(net) = 0, v is constant |
| Newton II | F(net) = ma |
| Newton III | forces always occur in equal and opposite pairs |
| weight | mg |
| apparent weightlessness | N = 0 |
| weightlessness | g = 0 |
| elastic force | F = kx |
| sliding sticking friction | opposes surfaces sliding |
| rolling friction | opposes rolling |
| air resistance | opposes motion |
| component of weight down a slope | mg sin(theta) |
| component of weight into slope | mg cos(theta) |
| free body diagram | all the forces on a single mass |
| tension forces | always pull |
| compression forces | always push |
| tension in strings | equal throughout the string |
| gravitational potential energy | mgh |
| kinetic energy | 0.5mv^2 |
| elastic potential energy | 0.5kx^2 |
| momentum | = mv and a vector |
| impulse | area under F-t graph or F(average) x time |
| work done | area under F-x graph or F(average) x displacement |
| energy transformed | equal to the work done |
| momentum is | always conserved (passed on) |
| elastic collisions | KE (before) = KE (after) |
| inelastic collisions | KE (before) > KE (after) |
| superelastic collisions (explosions) | KE (before) < KE (after) |
| efficiency | = work out/work in |
| power | work done/time |
