# physical science chapter 9

## 18 terms

### distance

the length of a path between two points

### speed

the distance the object travels per unit of time

### formula for speed

speed= distance (over) time

### energy

ability to do work or cause change

v=d (over) t

### average speed [definition]

the total distance traveled divided by the total time

### velocity

the speed in a given direction

### slope of graph

the steepness of a line on a graph
= rise [over] run

### velocity change rate

a change in velocity can involve either speed or direction

### acceleration

increasing speed, decreasing speed, or changing direction

### average acceleration

= final velocity - initial velocity [over] time

### gravitational potential energy

an object's gravitational potential depends on its weight and on its height relative to a reference point

### kinetic energy

the energy an object has due to its motion. depends on mass and speed

### reference point

a place or object used in comparison to determine if something is in motion

### displacement

the length and direction that an object has moved from its starting point

### instantaneous speed

the rate at which an object is moving at a given instant in time

### motion graphs (graphing acceleration)

distance-versus-time graph that is used interpret motion

### Law of Conservation of Energy

when one form of energy is transformed to another, no energy is destroyed in the process. also - ENERGY CANNOT BE CREATED OR DESTROYED :)

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