Flashcards in C4 Terms Deck (86)

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## Mechanics

### The scientific study of forces and motion. It consists of kinematics, dynamics and statics.

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## Kinematics

### The science of describing how things move. It involves the measurements and calculations of position, time, velocity, acceleration, and displacement within a reference frame.

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## Dynamics

### The study of how forces affect an object's motion. Based on Newton's 3 laws of motion.

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## Statics

### The description of how stationary objects react to pushes and pulls.

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## System

### Part of the universe under study separated from its surroundings by an actual or imaginary boundary.

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## Surroundings

### Everything outside a system's boundary.

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## Frame of reference

### The geometric space containing the reference point and coordinate axes from which a person observes or measures position and movement.

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## Coordinate axis

### An imaginary line that contains an origin as a point of reference and is marked off in distance units.

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## Interval

### A span of time during which a phenomenon is observed, calculated by subtracting the initial time from the final time. Always a positive number.

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## scalar

### Any measurable property, represented by an italicized symbol, that can be completely described by a single piece of information. It can be either positive, negative, or zero. Includes volume, temperature, time and mass measures.

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## Vector

### A measurable quantity, represented by a bold symbol (or a 1/2 arrow above the scalar symbol), that requires two pieces of information to fully describe it

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## distance

### A positive scalar quantity representing the linear dimension a moving object covers during a time interval. It also may be the magnitude of displacement.

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## displacement

### A vector quantity that describes the net distance and direction of motion. It is represented graphically by a vector arrow whose tail is at the starting point of motion and whose tip is the ending point.

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## magnitude

### The size of any quantity expressed as a positive number in appropriate units.

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## speed

### A scalar quantity that measures the rate of motion of a system. It may also be the magnitude of velocity.

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## average speed

### The average rate of motion over a time interval that accounts for variations in speed. It is a positive scalar quantity.

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## Velocity

### The vector quantity of the rate of displacement of a system or it can be described as speed in a given direction.

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## acceleration

### The rate of change of the speed or velocity of a system during a time interval. It can either be a vector or scalar quantity.

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## What is mechanics the study of?

### forces and motion

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## Who tried to explain motion by determining why things move?

### Aristotle

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## The early Greek philosopher Aristotle tried to explain _______ things moved.

### why

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## Galileo proposed that we study _______ things move before we conclude ________ things moved.

###
how

why

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## ________ proposed that we study how things moved before we conclude why they move.

### Galileo

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## ________ is generally given credit as the pioneer in the modern study of mechanics.

### Newton

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## Modern physics has divided the study of mechanics into what three parts?

###
kinematics

dynamics

statics

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##
Which branch describes how things move?

### kinematics

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## What is the branch of mechanics that describes why things move.

### Dynamics

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## A system of reference points from which the position and motion of an object can be determined is referred to as the _______________________.

### Frame of reference

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## What kind of quantities only have size?

### scalars

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