7-2 HMS science ch 1 physics vocab

21 terms

motion

an object's change in position relative to a reference point

speed

the rate at which an object moves

velocity

the speed of an object in a particular direction

acceleration

The rate at which velocity changes.

Unbalanced forces

Forces that produce a nonzero net force, which changes an object's motion

unit for force

net force

the combination of all forces acting on an object

friction

the force that opposes the motion of one surface as it moves across another surface

fluid friction

opposes the motion of an object through a fluid or gas

static friction

the friction force that acts on objects that are not moving

formula for average speed

total distance/ total time

formula for acceleration

final velocity - starting velocity/ time

gravity

a force of attraction between objects that is due to their masses

weight

A measure of the force of gravity on an object

mass

a measure of the amount of matter in an object

A push or a pull

Law of universal gravitation

law that states that all objects in the universe are attracted to all other objects

balanced forces

equal forces acting on an object in opposite directions

sliding friction

a force that opposes the direction of motion of an object as it slides over a surface

rolling friction

friction that occurs when an object rolls over a surface

lubricants

Materials that reduce friction