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S8P3.a & S8P3.b & .c
S8P3.a & S8P3.b
Term | Definition |
---|---|
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 an object's motion |
speed | the distance traveled divided by the time interval during which the motion occured |
velocity | the speed of an object in a particular direction |
acceleration | the rate at which velocity change over time; an object accelerates if it's speed, direction, or both change |
friction | a force that opposed motion between two surfaces that are in contact |
net force | the combination of all of the forces acting on an object |
balanced force | stated when net force acting on an object equal zero |
unbalanced force | stated when the net force 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 | a device that helps do work either by overcoming force or changing the direction of the applied force |
inclined plane | a simple machine that is a straight,slanted surface, which facilitates the raising of loads;ramp |
wedge | a simple machine that is made up of two inclined planes and that moves; often used for cutting |
screw | a simple machine that consist of a bar that pivots at a fixed point called a fulcrum |
pulley | a simple machine that consist of a wheel over which a rope, chair, or wire passes |
wheel and axle | a simple machine consisting of two circular objects of different sizes; the wheel is the large of the two circular object. |