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Forces and Motion

Force and Motion Vocabulary

TermDefinition
force a push or pull on an object
balanced force equal forces cancel each other out; no motion
unbalanced force unequal forces do not cancel each other out; object moves
acceleration the rate of change in velocity
speed the rate of distance over time
velocity an object's distance over time in a given direction
net force the sum of forces acting on an object
mass the amount of matter in an object
weight the measure of the force of gravity on an object
x-axis axis on a graph where time is plotted
y-axis axis on a graph where distance or speed is plotted
gravity force that pulls objects toward the center of the Earth
motion the change in an object's position
reference point stationary object by which motion can be judged
position an object's location
momentum the amount of motion taking place; mass x velocity
Newton's 1st Law Objects have a tendency to remain in their current position.
Newton's 2nd Law The force required to move an object is dependent upon the mass and acceleration
Newton's 3rd Law For every action, there is an equal and opposite reaction
friction a force of resistance between two objects in contact with each other.
static friction friction of an object that is not moving; the hardest type of friction to overcome
sliding friction friction between two objects sliding past each other; moving furniture
Newton unit of force
Joule unit of work
Watt unit of power
compound machine a machine made of 2 or more simple machines
simple machine a mechanical device that changes the direction or magnitude of a force
work the transfer of energy with a force that causes an object to move a certain distance
power the rate of the amount of work done over a period of time
mechanical advantage the factor by which a machine multiplies force
input force the amount of force put into a task
output force the amount of force that is actually applied to a task
wedge Made of two inclined planes put together; used to split, separate, or go under
inclined plane A straight slanted surface which reduces the effort by increasing the distance
pulley Uses grooved wheels and a rope, belt or chain
lever A stiff rod that rotates around a pivot point; Class 1, Class 2, Class 3
screw An inclined plane that wraps around a shaft
wheel and axle simple machine consisting of a wheel and a cylindrical shaft that goes through it.
Created by: rcvaughan