Flashcards in Ch. 6 Deck (15):

0

## What is speed?

### the ratio of the distance an object moves to the amount of time it takes to move

1

## how is instantaneous speed different from average speed?

###
Instantaneous speed- the speed at a certain moment in time

average speed- the speed for an entire trip

2

## How do you find the average speed?

###
V=d/t

(Velocity=distance divided by time)

3

## What type of speed does a speedometer on a car show?

### Instantaneous speed

4

## The slope on a distance-time graph represents __________.

### speed

5

## Describe a change in velocity.

###
-A moving object gains speed

-A moving object changes direction

-A moving object slows down

6

## A river flows at a velocity of 3 km/h relative to the riverbank A boat moves upstream at a velocity of 15 km/h relative to the river What is the velocity of the boat relative to the riverbank?

### 12 km/h upstream

7

## The rate at which velocity changes is called what?

### acceleration

8

## Because acceleration is a quantity that has both magnitude and direction, it is a ___________.

### vector

9

## ___________ is the result of increases and decreases in speed.

### acceleration

10

## Ignoring air resistance, a rock in free fall will have a velocity of what?

### 39.2

11

## Describe constant acceleration.

### a steady change in velocities

12

## What equation can you use to calculate the acceleration of an object?

### A=Vf-Vi/t

13

## When the final velocity is ____ than the initial velocity of an object, the acceleration is negative.

### less

14