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### 29 Cards in this Set

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 force a push or a pull gravity the force of attraction that exits between any two objects mass the amount of matter in an object weight a measure of the pull of gravity on an objects mass newton in the metric system the unit used to measure force or weight net force the combination of all the forces acting on an object balanced forces equal forces acting in opposite directions three examples of force a magnet, a sailboat a tennis ball relative motion the change in position of one object compared to the position of another frame if reference the object an observer uses to detect motion displacement the direction and shortest distance traveled during a change of position distance the total length of the path between two points speed the distance an object moves in a certain period of time instantaneous speed the speed at any given point speedometer a device that shows instantaneous speed velocity measure of both the speed and direction of a moving object acceleration the change in velocity during a particular time period three types of motion vibrational, circular, straight line difference between speed and velocity + Speed is the distance travelled by an object in a particular time. + Velocity is the speed in a particular direction. three ways an object can accelerate speed up, slow down, change direction law a statement that describes events or relationships that exist in nature inertia the resistance of an object to change in its state of motion friction a force between surfaces that resists the movement of one surface past the other surface air resistance the friction from air molecules htting an object as the object moves through the air newtons 1st law all objects resist changes in motion newton 2nd law an objects acceleration depends on the mass of the object and the size and direction of the force acting on it 2nd law written as equation force= mass x acceleration speed written as equation speed= distance - time newtons 3rd law when on object exerts a force upon a second object, the second object exerts an equal and opposite force upon the first object.