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Matter in Motion

unit 2 science vocabulary

QuestionAnswer
Motion an object’s change in position over time when compared with a reference point
Speed the rate at which an object moves; speed depends on the distance traveled and the time taken to travel that distance
Velocity the speed of an object in a particular direction
Acceleration the rate at which velocity changes; an object accelerates if its speed changes, if its direction changes, or if both its speed and direction change
Frame of Reference the point of view from which you observe the object in motion
Force a push or pull; all forces have both size and direction
Newton (N) the SI unit of force
Net Force the force that results from combining all the forces exerted on an object
Balance Force forces on an object that cause the net force to be zero; balanced forces do not change in motion or acceleration
Unbalanced Force forces on an object that cause the net force to be other than zero; unbalanced forces produce a change in motion or acceleration
Friction a force that oppose motion between two surfaces that are touching
Static Friction when a force is applied to an object but does not cause the object to move
Kinetic Friction occurs when two objects are moving relative to each other and rub together (like a sled on the ground).
Sliding Friction when two solid surfaces slide against each other
Rolling Friction the resistance that occurs when a round object such as a ball or tire rolls on a flat surface
Fluid Friction forces that oppose the relative motion of an object through a fluid (a liquid or gas).
Gravity a force of attraction between objects that is due to their masses
Weight a measure of the gravitational force exerted on an object, usually by the Earth
Mass the amount of matter that something is made of
Created by: red8
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