| A | B |
|---|
| air resistance | force that opposes motion of falling objects |
| artificial satellite | human made device that orbits Earth |
| centripetal force | causes circular motion |
| centripetal acceleration | acceleration towards the center of a circle |
| momentum | mass times velocity |
| symbol for momentum | p |
| units for momentum | kg x m/s |
| unit for Force | N |
| Newton's third law of motion | deals with action-reaction forces |
| Newton's second law of motion | a net force on a object causes the object to accelerate in the direction of the force |
| Law of conservation of momentum | the total amount of momentum does not change unless an outside force acts on it |
| Unit for mass | kg |
| Unit for acceleration | m/s2 |
| Formula for Force | mass times acceleration |
| An object in free fall is said to be | weightless |
| path of a projectile | curved |
| Newton's First Law | an object at rest or moving tends to stay at rest or moving unless a net force acts upon it |
| Friction | force that acts to resist sliding |
| Balanced forces | two or more forces whose effects cancel each other |
| Unbalanced forces | the net forces on an object are not zero |
| Force | a push or a pull |
| Net Force | is a total force felt by an object |
| Rolling Friction | allows you to ride a bike without skidding |
| Sliding Friction | Applying brakes to slow down |
| What affects how a force will affect an object? | direction |
| Newton's 2nd Law equation | a=net force/m |
| Normal Force | the outward force from a surface |
| Static Friction | keeps an object at rest |
| Gravitational Force of any object near Earth's surface | 9.8m/s2 |
| Terminal Velocity | The speed an object reaches when the force of gravity is balanced by the force of air resistance |
| Gravity | the force that exists between any two objects that have mass |
