# ICP CH11 Motion Exam

### 23 terms by peoneill Teacher

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### SI unit for speed/velocity

m/s (meters per second)

### SI unit for acceleration

m/s² (meters per second squared)

slope = velocity

### Graph: speed vs. time (slope)

slope = acceleration

### Net force

the combination of all forces acting on an object

### When is friction greatest?

When surfaces or rough, but overall shapes are flat.

### Positive accelerations

Speed is increasing

### Negative accelerations

Speed is decreasing

### Acceleration is zero

The object is not moving

### Positive velocity

Position is increasing (object moving forward)

### Negative velocity

Position is decreasing (object moving backward)

### Velocity is zero

Object is not moving.

### Velocity

Speed and direction

### When changing direction

This is a change in velocity, so acceleration applies!

### Static friction

friction between objects that are stationary

### Kinetic friction

friction between moving surfaces

### Rolling friction

the friction force that acts on rolling objects

### Friction

the force that opposes motion between two surfaces that are touching

### example of kinetic friction

the friction between your car windshield and the air as you drive down the road

### the fundamental forces

gravity, electromagnetic force, weak nuclear force, strong nuclear force (aka gravity, charges, nuclear)

A straight line

A straight line

Example: