| A | B |
|---|
| force | push or pull acting on an object |
| Newton | 1 kg.m/s2 : force causing acceleration |
| net force | the combined or total of all forces |
| friction | a force that opposes the movement of an object forward |
| friction types | rolling,static,sliding and fluid |
| air resistance | force moving opposite of gravity to reduce acceleration |
| gravity | force that causes objects downward toward earth |
| terminal velocity | constant velocity of falling object; gravity=air resistance |
| projectile motion | motion causes a curved path; horizontal velocity acting on gravity |
| inertia | the tendency of an resting object to resist a change in motion |
| mass | amount of matter an object contains and inertia acting on it |
| weight | measure of the force of gravity acting on mass W=mg |
| momentum | the product of an object's mass and velocity |
| law of conservation of motion | law that states loss of momentum of one object equals gain of another object |
| Newtons 1st Law of Motion | an object at rest stays at rest ; and an object in motion stays in motion : also Law of Inertia |
| Newton's 2nd Law of Motion | acceleration =Net force of object/mass of object |
| Newton's 3rd Law of Motion | law that states for every force on an object there is an equal and opposite force exerted on other object |
| rolling friction | ball bearings;wheels |
| electromagnetic energy | energy travelling through space as waves: X-rays, light |
| mechanical energy | a form of energy about position and kinetic energy: speeding trains,bouncing balls |
| thermal energy | energy associated with fast movement of atoms and heat: hot springs geyser |
| chemical energy | energy stored in atomic bonds released when bonds are broken; gasoline |
| electrical energy | energy of electric charges; batteries, lightning |
| nuclear energy | energy stored in atomic nuclei: sun, power plants |
