# Chapters 3 and 4

# Chapters 3 and 4

by Melissa Schultz
# 1. Acceleration

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

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

## 1.3. 9.8 m/s^2 in free fall

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

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

# 2. Newton's 2nd Law

## 2.1. Force vector = mass scalar * acceleration vector

# 3. Velocity

## 3.1. avg v = displacement / time

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

## 3.3. mass is not a factor

# 4. Position and Displacement

## 4.1. position needs origin, not always directional

## 4.2. displacement is vector, change in position

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

# 5. Words of the Day

## 5.1. Ithaca

## 5.2. Modus Operandi

## 5.3. Ne Plus Ultra

## 5.4. Panacea

## 5.5. Explore

## 5.6. Red Herring

## 5.7. Mash-up

# 6. 1-D Motion

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

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

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

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

# 7. Lab

## 7.1. Acceleration graphs

### 7.1.1. above x-axis is acceleration increasing, below is decreasing acceleration

## 7.2. Velocity graphs

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

# 8. 2-D Motion

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

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

## 8.2. Examples: catapault, kicking a soccer ball

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