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Unit 4 26-27

Forces

TermDefinition
Force A push or pull that can change an object’s motion.
Newton (N) The unit used to measure force.
Magnitude The size or strength of a force.
Direction The way a force is acting or an object is moving.
Net Force The total force on an object after all forces are combined.
Balanced Force Forces with a net force of zero that do not change an object’s motion.
Unbalanced Force Forces with a net force that is not zero and cause a change in motion.
Applied Force A force placed on an object by a person or another object.
Friction A force that opposes motion between surfaces that are touching.
Gravity A force of attraction between objects because of their mass.
Normal Force The support force a surface pushes on an object resting against it.
Inertia The tendency of an object to resist a change in its motion.
Newton’s First Law of Motion An object stays at rest or keeps moving the same way unless an unbalanced force acts on it.
State of Motion Whether an object is at rest or how it is moving, including its speed and direction.
Force Diagram A diagram that uses arrows to show the forces acting on an object.
Created by: LMS 7 Sci
 

 



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