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Forces and Motion

General Science Chapter 12

TermDefinition
Force A push or pull that acts on an object
Net Force The overall force acting on an object after all the forces are combined
Friction A force that opposes motion
Static Friction A force that acts on objects that are not moving
Sliding Friction A force that opposes the direction of motion of an object as it slides over a surface
Rolling Friction The friction force that acts on rolling objects
Fluid Friction Forces that opposes the motion of an object through a fluid
Air resistance Fluid friction acting on an object moving through the air
Gravity A force that acts between any two masses
Terminal velocity The constant velocity of a falling object when the force of air resistance equals the force of gravity
Projectile motion The motion of a falling object (projectile) after it is given an initial forward velocity
Inertia The tendency of an object to resist a change in its motion
Mass A measure of the inertia of an object and depends on the amount of matter the object contains
Weight The force of gravity acting on an object
Momentum The product of an object's mass and its velocity
Law of Conservation of Momentum If no net force acts on a system, then the total momentum of the system does not change
Electromagnetic Force A force that is associated with charged particles
Magnetic Forces A force that acts on certain metals, the poles of magnets, and on moving charges
Electric Forces Forces that act between charged objects or particles such as electrons and protons
Nuclear Forces Forces within the nucleus of an atom
Strong Nuclear Force A powerful force that acts only on the protons and neutrons in the nucleus, holding them together
Weak Nuclear Force An attractive force that acts only over a short range
Law of Universal Gravitation A law that states that every object in the universe attracts every other object
Centripetal Force A center-driven force that continuously changes the direction of an object to make it move in a circle
Created by: mepost