a natural event that involves a change in the position or location of something
distance traveled per unit time
a rate of motion determined by dividing the total distance traveled by the total travel time
The speed at any given point in time
Speed in a given direction.
the steepness of a line on a graph, equal to its vertical change divided by its horizontal change
the study of large scale movement and deformation of the earth's outer layers in terms of rigid plates over a partly molten layer of the upper mantle
The rate at which velocity changes
a push or pull exerted on an object
The overall force on an object when all the individual forces acting on it are added together
the force that opposes the motion of one surface as it moves across another surface
the force that pulls objects toward each other
a body of matter without definite shape
the vertical force exerted by a mass as a result of gravity
the motion of a falling object when the only force acting on it is gravity
the constant velocity of a falling object when the force of air resistance is equal in magnitude and opposite in direction to the force of gravity
an object thrown into the air with great force
the tendency of an object to resist a change in motion
the product of a body's mass and its velocity
conservation of momentum
Momentum of a system remains constant when there are no net external forces acting on it.
any celestial body orbiting around a planet or star
any force that causes an object to move in a circular path
the force applied to a unit area of surface
a continuous amorphous substance that tends to flow and to conform to the outline of its container: a liquid or a gas
upward force exerted on an object immersed in a fluid
mass divided by volume
the buoyant force on an object is equal to the weight of the fluid displaced by the object
a system that multiplies force by transmitting pressure from a small surface area through a confined fluid to a larger surface area
(physics) the rate of doing work
any mechanical or electrical device that transmits or modifies energy to perform or assist in the performance of human tasks
the number of times that a machine increases an input force
efficiency of machines
A comparison of the output work to the input work
The capacity to do work or to produce heat
the energy of motion
the energy that an object has because of the position, shape, or condition of the object
types of energy
radiant energy, chemical energy, mechanical energy, electrical and thermal energy, nuclear energy
that which has mass and occupies space
a nonrenewable energy resource formed from the remains of organisms that lived long ago; examples include oil, coal, and natural gas
a process in which a substance reacts with oxygen to give heat and light
A measure of the average energy of motion of the particles of a substance
The coldest temperature, 0 Kelvin, that can be reached. It is the hypothetical temperature at which all molecular motion stops.
the movement of thermal energy from a substance at a higher temperature to one at a lower temperature
the amount of heat required to raise the temperature of 1g of a substance 1 degree Celsius
the direct transfer of heat from one substance to another substance that it is touching
the transfer of heat by the movement of currents within a fluid
the transfer of energy by electromagnetic waves
a device designed to transmit electricity, heat, etc.
a material that does not allow heat or electrons to move through it easily.
change of state
The conversion of a substance from one physical form to another
The increase in volume of a substance due to an increase in temperature
motor that converts thermal energy to mechanical work
a device that uses outside energy source to transfer thermal energy from a cool area to a warm area
(physics) a device that attracts iron and produces a magnetic field
one of the two ends of a magnet where the magnetism seems to be concentrated
magnetic field lines
Invisible lines that map out the magnetic field around a magnet
smallest particle of an element
an instrument for showing directions, consisting of a needle or compass card that points to the north magnetic pole, which is near the North Pole.
continuous stream of high-energy particles released into space in all direction from the sun's corona
the region around a charged object where the object's electric force interacts with other charged objects
the continuous flow of electric charges through a material
a complete, unbroken path through which electric charges can flow
a substance that readily conducts e.g. electricity and heat
a material through which electric current DOES NOT pass easily
the difference in electrical charge between two points in a circuit expressed in volts
an electrical device that resists the flow of electrical current
A source of stored chemical energy for electric currents, having a positive (+) and a negative (-) terminal.
a circuit in which all parts are connected in a single loop
a closed electrical circuit in which the current is divided into two or more paths and then returns via a common path to complete the circuit
a device used to measure current in a circuit
a device used to measure voltage, or electrical potential energy difference
the product of voltage and current
a connection that allows current to take an unintended path
electrical device that can interrupt the flow of electrical current when it is overloaded
a device that trips like a switch and opens the circuit when overloaded
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