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6.4 Forces and Motion

Terms in this set (18)

Vector
A quantity that has a magnitude and a direction; shown by an arrow representing a force in one direction - must be labeled.
Magnitude
Amount of something; how large or small something is, represented by the length of vector arrow.
Force Pair
The equal and opposite forces always present when two objects are in contact. The objects push together equally or pull apart equally. For example, a book on a table or a balloon on a string. Shown as a dot at the contact of two objects, with equal and opposite vector arrows.
Force
A push or a pull
Stable
When the sum of the forces on an individual object add up to zero.
Balanced forces
When the sum of the forces on an individual object add up to zero.
Unbalanced forces
When the sum of the forces on an individual object do not add up to zero.
Gravity
A "downward" force exerted on everything that has mass by the earth.
Mass
The amount of matter in an object.
Independent variable
Variable/condition that is purposely changed in the investigation.
Dependent variable
The measured results of the investigation.
"This is the variable that depends on what is changed."
Constants
Variables/conditions that are kept the same in an investigation.
Standard of comparison
Something used to judge or measure against (in an investigation). Also sometimes referred to as a control group.
Collision
An event in which two (or more) bodies exert forces on each other for a period of time.
Fair investigation
An investigation or experiment in which the variables are carefully chosen and controlled. A fair investigation can be trusted to yield accurate results
Acceleration
The change in motion due to the object's changing speed.
Constant motion
An object which is not accelerating. Constant motion can mean no motion, or motion that is not changing in speed or direction.
Have impact on force
Both mass and speed of an object
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