Vocab #3 Flashcards
Machine
A device for increasing (or decreasing) a force or simply changing the direction of the force.
Energy
The property of an object or a system that enables it to do work; measured in joules.
Power
The rate at which work is done or energy is transformed, equal to the work done or energy transformed divided by time; measured in watts.
Watt
The SI unit of power. One Watt is expended when one Joule of work is done in one second.
Kinetic Energy
Energy of motion, equal to half the mass multiplied by the speed squared.
Fulcrum
The pivot point of a lever.
Mechanical Energy
The energy due to the position or the movement of something; potential or kinetic energy (or combination of both).
Work-Energy Theorem
The theorem that states whenever work is done, energy changes.
Pulley
A type of lever that is a wheel with a grove in its rim, which is used to change the direction of a force exerted by a rope or cable. A pulley or system of pulleys can also multiple forces.
Lever
A simple machine; made of a bar that turns around a fixed point.
Work
The product of an force on an object and the distance which the object is moved (when force is constant and motion is in a straight line in the direction of the force); measured in Joules.
Potential Energy-
Energy of Position, usually related to the relative position of two things, such as stone or Earth, or an electron and a nucleus.
Law of Conservation of Energy
Energy cannot be created nor destroyed. It may be transformed from one form into another, but the total amount of energy never changes.
Joule
The Si unit of work of all other forms of energy. One Joule (symbol J) of work is done when a force of one newton is exerted on an object moved 1 meter in the direction of the force.
Mechanical Advantage
The ratio of output force to input force for a machine.
