| A | B |
|---|
| Force | a push or pull that acts on an object |
| newton | the SI unit for force,equal to the force that causes a 1-kilogram mass to accelerate at a rate of 1 meter per sec square |
| net force | the overall force acting on an object after all the forces are combined |
| friction | a force that opposes the motion of object that touvh as they move past each other |
| static friction | a friction force that acts on objects that are not moving |
| sliding friction | a friction force that opposes the motion of an object as it slides over a surface |
| rolling friction | a friction that acts on rolling objects, caused by the change in shape at the point of rolling contact |
| fluid friction | a friction force that opposes the motion of an object of an object through a fluid |
| air resistance | fluid friction acting on an object moving through the air |
| gravity | the attraction between any two objects because of there masses |
| terminal velocity | the constant velocity of a falling object when the force of air resistance equals the force of gravity |
| projectile motion | the curved path of an object in free fall after it is given an initial forward velocityq |
| inertia | the tendency of an object to resist a change in its motion |
| mass | the amount of matter in an object |
| weight | the force of gravity acting on an object |
| momentum | the product of an object's mass and its velocity |
| law of conservation of momentum | law stating that the total momentum of a system does not change if no net force acts on the system |
