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# Physical Science

### Forces Test

TermDefinition
Force a push or a pull that acts on an object
Newton force that causes a 1-kilogram mass to accelerate at a rate of 1 meter per second each second
Net Force is the overall force acting on an object after all the forces are combined
Friction a force that opposes the motion of objects that touch as the move past each other
Static Friction the friction 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 frictional force that acts on rolling objects
Fluid Friction 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. Gravity is an attractive force, that is , it pulls objects together.
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 after it is given an initial forward velocity
Inertia
Mass the 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
First Law of Motion according to this law of motion, the state of motion of an object does not change as long as the net force acting on the object is zero.
Second Law of Motion according to this law of motion, the acceleration of an object is equal to the net force acting on it divided by the object’s mass
Third Law of Motion according to this law of motion, whenever one object exerts a force on a second object, the second object exerts an equal and opposite force on the first object
momentum the product of an object’s mass and its velocity
conservation of momentum if no net force acts on a system , then the total momentum of the system does not change
Created by: aemiller