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science vocab 3

QuestionAnswer
force a push or pull exerted on an object in order to change the motion of the object; force has size and direction
motion an object's change in position relative to a reference point
reference point a stationary object that is used to describe object's motion
speed the distance traveled divided by the time interval during which the motion occurred
velocity the speed of an object in a particular direction
acceleration the rate at which velocity changes over time;an object accelerates if its speed,direction,or both change
friction a force that opposes motion between two surfaces
net force the combination of all the forces acting on an object
balanced force stated when the net forces acting on an object equal zero
unbalanced force stated when the net forces acting on an object is not zero
inertia the tendency of an object to resist being moved or, if the object is moving, to resist a change in speed or direction until an outside force acts on the object
gravity a force of attraction between objects that is due to their masses
work the transfer of energy to an object by using a force that causes the object to move in the direction of the force
machine an apparatus using or applying mechanical power and having several parts, each with a definite function and together performing a particular task.
inclined plane a plane inclined at an angle to the horizontal.
wedge a triangular shaped tool, and is a portable inclined plane, and one of the six classical simple machines.
screw an act of turning a screw or other object having a thread.
lever a rigid bar resting on a pivot, used to help move a heavy or firmly fixed load with one end when pressure is applied to the other.
pulley a wheel with a grooved rim around which a cord passes. It acts to change the direction of a force applied to the cord and is chiefly used (typically in combination) to raise heavy weights.
wheel and axle a simple lifting machine consisting of a rope that unwinds from a wheel onto a cylindrical drum or shaft joined to the wheel to provide mechanical advantage.
Created by: jackiboyfan