Definitions Flashcards
Define speed
Distance traveled per unit time
Define acceleration
Change in velocity per unit time
Velocity
Speed in a given direction
Free-fall
An object is at free fall when it is moving only under the influence of gravity.
Mass
Amount of matter in an object.
Force
Action of one body on a second body that causes its velocity to change.
Weight
Gravitational force on an object that has mass
Gravity
A force that exists between any two objects that has mass
Momentum
Product of mass and its velocity
Conservation of Momentum
Total momentum before collision = Total momentum after collision, provided no external force acts
Density
The ratio of mass to volume for a substance.
Pressure
Force per unit area at right angles to a surface.
Acceleration of free fall
The acceleration of an object falling freely under gravity
Impulse
The force multiplied by the time for which it acts.
The change in momentum.
Moment
The turning effect of a force about a point, given by force x perpendicular distance from the pivot
