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# Force and Friction

### for 6th grade science in Texas

force a push or a pull
newton the unit used to measure force
net force the force that results from combining all the forces exerted on an object
unbalanced forces occur when the net force on an object is not equal to zero; this causes motion to occur
balanced forces occur when the net force on an object is equal to zero
friction a force that opposed motion between two objects that are touching
sliding friction the friction that occurs when two objects are moving directly against each other; ex. an eraser moving across a desk
rolling friction friction between an object with wheels and another surface; usually less than sliding friction; ex. skateboard
fluid friction opposes the motion of objects travelling through fluids like liquids and gasses; usually less than sliding friction; ex. swimming
static friction a force that keeps an object from moving; ex. push a book and it doesn't move
lubricants substances that are applied to surfaces to reduce the friction between objects; ex. oil, wax, grease
fluids liquids such as water and milk and gasses such as air and helium
gravitational force all objects have one; depends on the mass of the object
Created by: bwilliamsscience

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