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9 - Mod 10 Lesson 3

TermDefinition
force A push or a pull
balanced forces forces acting on an object that combine and form a net force of zero
unbalanced forces forces acting on an object that combine and form a net force that is not zero
net force the combination of all the forces acting on an object at the same time
friction the force that opposes movement between touching surfaces and always acts against the direction of motion.
static friction the force of friction between surfaces not in motion
sliding friction friction that occurs when one solid surface slides over another
rolling friction the friction between surfaces, when an object, such as a wheel or a ball, rolls freely over a surface.
fluid friction the friction that occurs as an object moves through a fluid
gravity the force that attracts masses together
terminal velocity the speed at which the force of gravity equals air resistance
mass the amount of matter in an object
weight The measurement of the force of gravity on an object that has mass.
force of gravity; mass of the object What are two things that weight depends on?
9.8 m/s² acceleration due to gravity on earth
decreases The force of gravity _____________ as the distance between masses increase.
F = m(a) force formula
The mass of the object; the distance between the two objects What are the two things the strength of gravity depends on?
⅙th That of Earth Gravity of the moon compared to Earth
speeds up When the net force (and therefore acceleration) is in the same direction as the velocity what happens?
slows down When the net force is in the opposite direction as the velocity what happens?
Created by: Ms. Greenup
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