30 terms

What is mechanics?

Modern study of motion

What is kinematics?

A description of how things move

What is dynamics?

A description of what causes things to move

What is a boundary?

Actual surfaces, or imaginary boxes

What is a system?

Everything inside the boundary

What is a surrounding?

Everything outside the boundary

What is an accelerated reference frame?

Observational reference frame is accelerationg with object

What is a fixed reference frame?

You are in a fixed position watching the object moving

What is a rotational reference frame?

Rotation objects are stationary

What is a coordinate axis?

Imaginary line marked off in units

How do you calculate the time interval?

Subract the intial time from the final time

What are used to illustrate vectors in diagrams?

arrows

What is motion?

it occurs when a system's postion changes during an interval of time

What is acceleration?

The rate of change of the speed of velocity during a given time interval

What is force?

a push or pull on a system

What unit is used to describe force, and what does it mean?

(N) it means Newton

What is free fall?

When an object is falling do to gravity alone

What number represents the acceleration of gravity?

9.81 or just 9.8

What is drag?

A form of friction call air resistance

What is terminal velocity?

When the objects velocity is constant for the remainder of it's fall

What is momentum?

How much force is required to change a moving objects motion

What is velocity?

The rate of displacement

What is inertia?

Objects continue moving indefintely unless they are affected by some external force

What number represents G?

6.67*10^-11 (six point six seven times ten to the negative eleven)

What are the two properties of a moving object that affect its momentum?

mass and velocity

What three variacle factors determine the force of gravity between any two objects?

mass 1 and mass 2, and destance between the centers

What units are Newtons derived from?

kg(m/s2)

What is distance?

Distance is how far you actually traved

What is displacement?

How far you are from when you started

What is the difference between scalar and vector

scalar is speed and vector is direction