Download Forces

Student Name: _______________________________
Mrs. Lee – 8th Grade Physical Science
Period #: ______
Date: _____________
Chapter 10 Vocabulary: Forces
Newton: The SI unit used for the magnitude, or strength, of a force (p 377)
Unbalanced forces: Forces that cause an object’s velocity to change (p 378)
Friction: The force that one surface exerts on another when the 2 surfaces rub against each other (p
383)
Sliding friction: Friction that occurs when one solid surface slides over another (p 384)
Force: A push or pull exerted on an object (p 376)
Net force: The overall force on an object when all the individual forces acting on it are added
together (p 377)
Balanced forces: Equal forces acting on an object in opposite directions (p 378)
Static friction: Friction that acts on objects that are not moving (p 384)
Fluid friction: Friction that occurs as an object moves through a fluid (p 384)
Mass: A measure of how much matter is in an object (p 386)
Free fall: The motion of a falling object when the only force acting on it is gravity (p 388)
Projectile: An object that is thrown (p 390)
Rolling friction: Friction that occurs when an object rolls over a surface (p 384)
Gravity: The force that pulls objects toward each other (p 386)
Weight: A measure of the force of gravity on an object (p 387)
Air resistance: The fluid friction experienced by objects falling through the air (p 389)
Tension: An elastic force that stretches or pulls on the molecules in matter (p 390)
Conservation of momentum: The rule that in the absence of outside forces the total momentum of
objects that interact does not change (p 397)
Satellite: Any object that orbits around another object in space (p 405)
Compression: An elastic force that squeezes or pushes the molecules in matter together (p 390)
Inertia: The tendency of an object to resist any change in its motion (p 392)
Momentum: The product of an object’s mass & velocity (p 398)
Centripetal force: A force that causes an object to move in a circle (p 405)