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Force and motion

QuestionAnswer
force a push or pull
contact force force where two objects touch each other
Noncontact forces force that results when two objects do not touch (gravity, magnetic force, electric force)
Friction a force that opposes motion
Gravity a force of attraction, or pull, between two objects
balanced force forces equal in strength but acting in opposite directions; no motion
Unbalanced force when the forces acting on an object are not equal and balanced; motion
Net force the sum of forces acting on an object
Newtons the unit of measurement for force
Motion to start, stop, or change the direction of an object's movement
Inertia the tendency to resist change in motion
Speed the distance an object moves in an amount of time
mass the amount of matter an object contains
acceleration to speed up, slow down, or change direction
action the first force applied to an object
reaction the second force that is equal in strength and opposite in direction
 



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