click below
click below
Normal Size Small Size show me how
force and motion
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 objects change in position relative to a reference point |
Reference Point | A stationary objects that is used to describe an objects 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 is its speed, direction, or both change |
Friction | A force that oppose motion between two surfaces that are in contact |
Net force | The combination of all of the forces acting on an objects |
Balanced Force | Stated when the 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 and outside force acts on the objects |
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 a 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; a ramp |
Wedge | A simple machine that is made up of two inclined planes and that moves;often used for cutting |
lever | A simple machine that consists of a bar that pivots at a fixed point called a fulcrum |
Screw | a simple machine that consists of an inclined plane wrapped around a cylinder |
pulley | a simple machine that consists 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 objects |