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Chapters 3 and 4
by Melissa Schultz
# Chapters 3 and 4

## Acceleration

### rate of change of motion; change in velocity, m/s^2

### a = change in velocity / change in time

### 9.8 m/s^2 in free fall

### mass is indirectly proportionate; mass can be defined as amount of resistance to change in motion

### F = ma is definition of acceleration; F is in Newtons and a is m/s^2

## Newton's 2nd Law

### Force vector = mass scalar * acceleration vector

## Velocity

### avg v = displacement / time

### instantaneous velocity: at a given moment, speed as time approaches 0

### mass is not a factor

## Position and Displacement

### position needs origin, not always directional

### displacement is vector, change in position

### can be found using vectors and x and y components

## Words of the Day

### Ithaca

### Modus Operandi

### Ne Plus Ultra

### Panacea

### Explore

### Red Herring

### Mash-up

## 1-D Motion

### v(f) = v(0) + at

### x = x(0) + v(0)t + 0.5at^2

### v^2 = v(0)^2 + 2a(x(f) - x(0))

### Examples: free fall, car moving in x or y direction only

## Lab

### Acceleration graphs

### Velocity graphs

## 2-D Motion

### same equations as for 1-D, but with velocity and position for x and y separately

### Examples: catapault, kicking a soccer ball

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above x-axis is acceleration increasing, below is decreasing acceleration

parabolic identifies movement; open down is -a and open up is +a

for y, a always is 9.8 m/s^2