friction and gravity Flashcards
1
Q
friction
A
the general term for the force that one surface exerts on another when they rub against each other
2
Q
rolling friction
A
the kind of friction that results when a wheel turns on a surface
3
Q
sliding friction
A
the kind of friction that results when you rub sandpaper against wood
4
Q
fluid fricition
A
the kind of friction that exists between oil and a door hinge
5
Q
weight
A
a measure of the force of gravity on an object
6
Q
free fall
A
the state that exists when the only force acting on an object is gravity
7
Q
gravity
A
the force that accelerates objects toward Earth
8
Q
terminal velocity
A
a falling object reaches this when forces of gravity and air resistance are balanced
9
Q
air resistance
A
the kind of friction that slows a falling object
