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PScienceSM2-U1
Study stack for Physical Science Chapter 11 and 12
| Term | Definition |
|---|---|
| frame of reference- | a system of objects that are not moving with respect to one another. |
| relative motion,- | movement in relation to a frame of reference ex. people standing looking at train see people moving- people on train don't see self moving |
| distance, | the length of a path between two points |
| vector | a quantity that has magnitude and direction. Magnitude can be size, length, or amount |
| resultant vector | the vector sum of two or more vectors |
| speed -- | the ratio of the distance an object moves to the amount of time the object moves |
| average speed | - is computed for the entire duration of a trip - average speed = total distance/total time |
| instantaneous speed | is the rate at which an object is moving at a given moment in time ex. speedometer speed driving down the street |
| velocity, | the speed and direction in which an object is moving |
| acceleration, | as changes in speed, changes in direction, or changes in both. |
| free fall, | the movement of an object toward Earth solely because of gravity. |
| constant acceleration, | The velocity of an object moving in a straight line changes at a constant rate when the object is experiencing constant acceleration. |
| Force | a push or a pull that acts on an object |
| Newton | the force that causes a 1-kilogram mass to accelerate at a rate of 1 meter per second each second |
| Net Force | the overall force acting on an object after all the forces are combined. |
| Friction | a force that opposes the motion of objects that touch as they move past each other. |
| Static Friction | is the friction force that acts on objects that are not moving. |
| Sliding Friction | a force that opposes the direction of motion of an object as it slides over a surface. |
| Rolling Friction | the friction force that acts on rolling objects |
| Fluid Friction | opposes the motion of an object through a fluid |
| Air Resistance | Fluid friction acting on an object moving through the air |
| Gravity | a force that acts between any two masses. Gravity is an attractive force, that is, it pulls objects together |
| terminal velocity | the constant velocity of a falling object when the force of air resistance equals the force of gravity. |
| projectile motion | the motion of a falling object (projectile) after it is given an initial forward velocity. Air resistance and gravity are the only forces acting on a projectile. |
| Inertia | the tendency of an object to resist a change in its motion. |
| Mass | is a measure of the inertia of an object and depends on the amount of matter the object contains. |
| Weight | is the force of gravity acting on an object |
| Momentum | the product of an object's mass and its velocity. |
Created by:
gilcherdonna
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