| A | B |
|---|
| m/s2 in a direction | unit for acceleration |
| m/s in a direction | unit for velocity |
| Newton | unit of measure that equals the force required to accelerate 1 kilogram of mass at 1 meter per second per second |
| Newton's 1st law | continues in an existing state of rest or continual motion in the same direction until acted on be external force |
| inertia | object's resistance to change in motion |
| force | a push or pull exerted on an object |
| Newton's 2nd law | sum of the forces is equal to mass of the object multiplied by the object's acceleration |
| Newton's 3rd law | forces act in pairs and for every action there is an equal and opposite reaction |
| friction | the resistance to motion that occurs when an object encounters when moving over a surface |
| momentum | product of an object's mass and velocity |
| kg * m/s in a direction | unit for momentum |
| gravity | force the pulls objects toward eachother |
| velocity | speed in a definite direction |
| acceleration | rate at which velocity changes |
| mass | as this increases, inertia increases |
| motion | the state at which an object's distance from position is changing |
| action force | force exerted by first object on the second object |
| reaction force | force exerted by second object in response to first object |
| drag | force that acts in the opposite direction as object moving through air |
| centripetal force | force that acts on an object in a circular path and is directed to the center |
| Newton's 3rd law | as fuel in the rocket ignites, the force of gas expansion and explosion pushes out the back of the rocket and send the rocket skyward |
| Newton's 2nd law | as ice skater pushes harder with his leg muscles, he begins to move faster |
| Newton's 1st law | when you are standing up in a subway train, and the train suddenly stops, your body continues to go forward |
| friction | the blade of an ice skate skimming over the ice results in the production of heat energy causing the ice to melt |
| air resistance | sleek shape of bobsled allows greater speeds because of decrease in ____________ |
| terminal velocity | the constant speed that a freely falling object eventually reaches when the resistance of the medium through which it is falling prevents further acceleration. |
| lift | upward-acting force |
| thrust | described by Isaac Newton's second and third laws as reaction force |
| Bernoulli's Principle | the principle in hydrodynamics that an increase in the velocity of a stream of fluid results in a decrease in pressure. |
| net force | combination of all forces acting on an object. it changes the objects motion. |
| types of forces | tension, thrust, normal force, support force, weight, friction |
| weight | force with which the earth, moon, or other massively large object attracts another object towards itself. |
| gravity | the universal force of attraction acting between all matter. |
| 9.80 m/s^2 down | acceleration due to gravity on Earth |
| mass | as _____ increases, inertia increases |
| unbalanced force | Forces that produce a nonzero net force, which changes an objects motion |
| net force | The overall force on an object when all the individual forces acting on it are added together |
