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# Forces&Interactions

QuestionAnswer
acceleration a change in the velocity (speed, direction, or both) of a body
unbalanced forces push or pull on an object that is not subject to an equal and opposite push or pull
balanced forces when two equal forces are applied to an object in opposite directions, the object does not move
force mass x acceleration= a pull or push that is applied to an object
newton the SI unit of force. It is equal to the force that would give a mass of one kilogram an acceleration of one meter per second per second
action force movement; something that happens
reaction force response to an action force; equal and opposite
mass the amount of matter in an object
Newton's First Law a body remains at rest, or moves in a straight line at a constant speed, unless acted upon by an outside force.
Newton's Second Law the acceleration of an object is proportional to the force acting upon it
Newton's Third Law for every action there is an equal and opposite reaction
velocity the speed and direction of an object's motion
magnitude size of ground movement caused by seismic waves due to energy released
gravity a force that exists between any two objects that have mass
air resistance comes when an object moves through the atmosphere. At slower speeds, it is negligible, but at higher speeds, it can become significant.
vacuum an area in which there is no matter
laws of motion Newton developed three laws of motion. They are considered laws not theories because he found them to be true, but could not explain why.
thrust a reaction force that pushes an object forward
drag resistance by friction from air or water moving over a surface
weight the force of gravity on an object
Aristotle leader in scientific thinking ; proposed that a force must be constantly applied to an object to keep it moving
Isaac Newton improved on Aristotle's idea about motion adding information about inertia
variable a quantity or condition that can be changed in an experiment
kinetic energy the energy an object has because of its motion
potential energy the amount of energy that is stored in an object; energy that an object has because of its position relative to other objects
heat energy when potential energy is converted into kinetic energy, some of that energy is always in the form of:
joules a unit of measurement of energy
motion a change of position in an object
gravitational potential energy energy stored due to position in a gravitational field; commonly due to Earth's gravity
chemical potential energy amount of chemical energy stored in a substance
elastic potential energy The force that resists a change in shape
electric potential energy The force between electrically charged particles that are moving
nuclear potential energy Even the tiny nucleus of an atom has potential energy. When atomic nuclei split, they release lots of energy.
net force sum of all the forces acting on an object.
vector quantity having both magnitude and direction.
opposing forces two forces acting against each other
rate of acceleration depends on the mass of the object and the force applied to it
friction a force that opposes the motion of a body across a surface or through a gas or liquid
push to press on an object for the purpose of moving it
tension quantity having both magnitude and direction.
magnetic force the action between two magnetic poles
electric force Electric forces involve the attractive or repulsive force between two charged particles or objects.
contact forces are forces that occur with an object being in contact with another. include frictional force, tension force, normal force, air resistance force, applied force, and spring force.
non-contact forces invisible forces that do not require objects to be in contact. Examples include gravity, electric forces, and magnetic forces.
normal force the force from the ground that pushes back on the gravitational force.
spring potential energy The force exerted by a stretched or compressed coil on an object attached to it
applied force is a force that comes from another object, like a person pushing a cart.
Created by: ledee.workman