# Motion 2

### 11 terms by Spieringsk

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Physical Science Spierings, RHS Spring 2012

### Weight

the quantity of heaviness, taking into account gravity

### Mass

measure of how much matter is in an object

### Force

strength put on an object; has direction (is a vector quantity); measured as newtons

### Friction

the resistance of one surface has on another object or surface

### Gravity

force on an object to tend to fall towards the center of the earth

### Newton

a unit to measure force; equals: 1kg * m/s2

### Inertia

a characteristic of matter which states the object will continue in its existing state of rest or motion unless an outside force acts on it (Latin word means lazy)

### Negative Acceleration

when acceleration is in a direction opposite to the velocity or in the direction of the negative axis on the velocity vs. time graph

### Positive Acceleration

when the velocity vs. time graph has a positive slope; velocity is increasing

### Instantaneous Speed

the speed at a given moment (ex: a car's speedometer)

### Average Speed

calculated using the total distance traveled and the total time traveled
Web to show the difference between instantaneous &average speed: http://bit.ly/zOeFBY

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